Source Code for NTP server time update:
video: https://youtu.be/Zx7hk7hxabM
/*
* TimeNTP_ESP8266WiFi.ino
* Example showing time sync to NTP time source
*
* This sketch uses the ESP8266WiFi library
*/
#include "TimeLib.h"
#include <ESP8266WiFi.h>
#include <WiFiUdp.h>
const char ssid[] = "xxxx"; // your network SSID (name)
const char pass[] = "xxxxxxxxx"; // your network password
/*
// NTP Servers:
//static const char ntpServerName[] = "us.pool.ntp.org";
//static const char ntpServerName[] = "time.nist.gov";
//static const char ntpServerName[] = "time-a.timefreq.bldrdoc.gov";
//static const char ntpServerName[] = "time-b.timefreq.bldrdoc.gov";
//static const char ntpServerName[] = "time-c.timefreq.bldrdoc.gov";
*/
// NTP Servers:
const char * ntpServerName;
String ntpServerName1 = "us.pool.ntp.org";
String ntpServerName2 = "time.nist.gov";
String ntpServerName3 = "time-a.timefreq.bldrdoc.gov";
String ntpServerName4 = "time-b.timefreq.bldrdoc.gov";
String ntpServerName5 = "time-c.timefreq.bldrdoc.gov";
const int timeZone = 5; // Indian Time Zone (+5.30)
//const int timeZone = -5; // Eastern Standard Time (USA)
//const int timeZone = -4; // Eastern Daylight Time (USA)
//const int timeZone = -8; // Pacific Standard Time (USA)
//const int timeZone = -7; // Pacific Daylight Time (USA)
WiFiUDP Udp;
unsigned int localPort = 8888; // local port to listen for UDP packets
time_t getNtpTime();
void digitalClockDisplay();
void printDigits(int digits);
void sendNTPpacket(IPAddress &address);
int Status=0;
void setup()
{
Serial.begin(115200);
while (!Serial) ; // Needed for Leonardo only
delay(250);
Serial.println("TimeNTP Example");
Serial.print("Connecting to ");
Serial.println(ssid);
WiFi.begin(ssid, pass);
while (WiFi.status() != WL_CONNECTED){
delay(500);
Serial.print(".");
}
for(int Loop=0;Loop<5;Loop++)
{
if(Loop==0) ntpServerName = ntpServerName1.c_str();
if(Loop==1) ntpServerName = ntpServerName2.c_str();
if(Loop==2) ntpServerName = ntpServerName3.c_str();
if(Loop==3) ntpServerName = ntpServerName4.c_str();
if(Loop==4) ntpServerName = ntpServerName5.c_str();
Serial.print("IP number assigned by DHCP is ");
Serial.println(WiFi.localIP());
Serial.println("Starting UDP");
Udp.begin(localPort);
Serial.print("Local port: ");
Serial.println(Udp.localPort());
Serial.println("waiting for sync");
setSyncProvider(getNtpTime);
setSyncInterval(300);
if(Status==1){
if(Loop==0) Serial.println("Ressponse from URL 1");
if(Loop==1) Serial.println("Ressponse from URL 2");
if(Loop==2) Serial.println("Ressponse from URL 3");
if(Loop==3) Serial.println("Ressponse from URL 4");
if(Loop==4) Serial.println("Ressponse from URL 5");
break;
}
}
}
time_t prevDisplay = 0; // when the digital clock was displayed
int ADC_Values=0;
int ADC_Count=0;
int ADC_Sum=0;
int check=0;
void loop()
{
if(timeStatus()!=timeNotSet)
{
if(now()!= prevDisplay){ //update the display only if time has changed
prevDisplay = now();
digitalClockDisplay();
/*
ADC_Sum+=analogRead(A0);ADC_Count++;
if(ADC_Values==0)
{
ADC_Values=ADC_Values=(int)(4200*((ADC_Sum/ADC_Count)/1024.0));
check=(ADC_Values/10)%10;
ADC_Values=ADC_Values/100;
if(check>=5)ADC_Values++;
Serial.print("Battery: ");
Serial.print(ADC_Values/10);
Serial.print(".");
Serial.print(ADC_Values%10);
Serial.println(" V");
}
if(ADC_Count>=10)
{
//Serial.print("Adc Values: ");
//Serial.println(ADC_Values);
ADC_Values=(int)(4200*((ADC_Sum/ADC_Count)/1024.0));
Serial.print("Battery: ");
Serial.print(ADC_Values);
Serial.println(" mV");
check=(ADC_Values/10)%10;
ADC_Values=ADC_Values/100;
if(check>=5)ADC_Values++;
Serial.print("Battery: ");
Serial.print(ADC_Values/10);
Serial.print(".");
Serial.print(ADC_Values%10);
Serial.println(" V"); ADC_Count=0;ADC_Sum=0;
}*/
}
}
}
String validPacket = "Time:";
void digitalClockDisplay()
{
// digital clock display of the time
Serial.print("DATE:");
Serial.print(day());
Serial.print(".");
Serial.print(month());
Serial.print(".");
Serial.print(year());
Serial.println();
Serial.print("TIME:");
Serial.print(hour());
printDigits(minute());
printDigits(second());
Serial.println(" ");
Serial.println(" ");
}
void printDigits(int digits)
{
// utility for digital clock display: prints preceding colon and leading 0
Serial.print(":");
if (digits < 10)
Serial.print('0');
Serial.print(digits);
}
/*-------- NTP code ----------*/
const int NTP_PACKET_SIZE = 48; // NTP time is in the first 48 bytes of message
byte packetBuffer[NTP_PACKET_SIZE]; //buffer to hold incoming & outgoing packets
time_t getNtpTime()
{
IPAddress ntpServerIP; // NTP server's ip address
while (Udp.parsePacket() > 0) ; // discard any previously received packets
Serial.println("Transmit NTP Request");
// get a random server from the pool
WiFi.hostByName(ntpServerName, ntpServerIP);
Serial.print(ntpServerName);
Serial.print(": ");
Serial.println(ntpServerIP);
sendNTPpacket(ntpServerIP);
uint32_t beginWait = millis();
while (millis() - beginWait < 1500) {
int size = Udp.parsePacket();
if (size >= NTP_PACKET_SIZE) {
Serial.println("Receive NTP Response");
Udp.read(packetBuffer, NTP_PACKET_SIZE); // read packet into the buffer
unsigned long secsSince1900;
// convert four bytes starting at location 40 to a long integer
secsSince1900 = (unsigned long)packetBuffer[40] << 24;
secsSince1900 |= (unsigned long)packetBuffer[41] << 16;
secsSince1900 |= (unsigned long)packetBuffer[42] << 8;
secsSince1900 |= (unsigned long)packetBuffer[43];Status=1;
return (secsSince1900 - 2208988800UL + timeZone * SECS_PER_HOUR)+1800;
}
}
Serial.println("No NTP Response :-(");Status=0;
return 0; // return 0 if unable to get the time
}
// send an NTP request to the time server at the given address
void sendNTPpacket(IPAddress &address)
{
// set all bytes in the buffer to 0
memset(packetBuffer, 0, NTP_PACKET_SIZE);
// Initialize values needed to form NTP request
// (see URL above for details on the packets)
packetBuffer[0] = 0b11100011; // LI, Version, Mode
packetBuffer[1] = 0; // Stratum, or type of clock
packetBuffer[2] = 6; // Polling Interval
packetBuffer[3] = 0xEC; // Peer Clock Precision
// 8 bytes of zero for Root Delay & Root Dispersion
packetBuffer[12] = 49;
packetBuffer[13] = 0x4E;
packetBuffer[14] = 49;
packetBuffer[15] = 52;
// all NTP fields have been given values, now
// you can send a packet requesting a timestamp:
Udp.beginPacket(address, 123); //NTP requests are to port 123
Udp.write(packetBuffer, NTP_PACKET_SIZE);
Udp.endPacket();
}
//=======================================================================
/* DateStrings.cpp
* Definitions for date strings for use with the Time library
*
* Updated for Arduino 1.5.7 18 July 2014
*
* No memory is consumed in the sketch if your code does not call any of the string methods
* You can change the text of the strings, make sure the short strings are each exactly 3 characters
* the long strings can be any length up to the constant dt_MAX_STRING_LEN defined in TimeLib.h
*
*/
#if defined(__AVR__)
#include <avr/pgmspace.h>
#else
// for compatiblity with Arduino Due and Teensy 3.0 and maybe others?
#define PROGMEM
#define PGM_P const char *
#define pgm_read_byte(addr) (*(const unsigned char *)(addr))
#define pgm_read_word(addr) (*(const unsigned char **)(addr))
#define strcpy_P(dest, src) strcpy((dest), (src))
#endif
#include <string.h> // for strcpy_P or strcpy
#include "TimeLib.h"
// the short strings for each day or month must be exactly dt_SHORT_STR_LEN
#define dt_SHORT_STR_LEN 3 // the length of short strings
static char buffer[dt_MAX_STRING_LEN+1]; // must be big enough for longest string and the terminating null
const char monthStr0[] PROGMEM = "";
const char monthStr1[] PROGMEM = "January";
const char monthStr2[] PROGMEM = "February";
const char monthStr3[] PROGMEM = "March";
const char monthStr4[] PROGMEM = "April";
const char monthStr5[] PROGMEM = "May";
const char monthStr6[] PROGMEM = "June";
const char monthStr7[] PROGMEM = "July";
const char monthStr8[] PROGMEM = "August";
const char monthStr9[] PROGMEM = "September";
const char monthStr10[] PROGMEM = "October";
const char monthStr11[] PROGMEM = "November";
const char monthStr12[] PROGMEM = "December";
const PROGMEM char * const PROGMEM monthNames_P[] =
{
monthStr0,monthStr1,monthStr2,monthStr3,monthStr4,monthStr5,monthStr6,
monthStr7,monthStr8,monthStr9,monthStr10,monthStr11,monthStr12
};
const char monthShortNames_P[] PROGMEM = "ErrJanFebMarAprMayJunJulAugSepOctNovDec";
const char dayStr0[] PROGMEM = "Err";
const char dayStr1[] PROGMEM = "Sunday";
const char dayStr2[] PROGMEM = "Monday";
const char dayStr3[] PROGMEM = "Tuesday";
const char dayStr4[] PROGMEM = "Wednesday";
const char dayStr5[] PROGMEM = "Thursday";
const char dayStr6[] PROGMEM = "Friday";
const char dayStr7[] PROGMEM = "Saturday";
const PROGMEM char * const PROGMEM dayNames_P[] =
{
dayStr0,dayStr1,dayStr2,dayStr3,dayStr4,dayStr5,dayStr6,dayStr7
};
const char dayShortNames_P[] PROGMEM = "ErrSunMonTueWedThuFriSat";
/* functions to return date strings */
char* monthStr(uint8_t month)
{
strcpy_P(buffer, (PGM_P)pgm_read_word(&(monthNames_P[month])));
return buffer;
}
char* monthShortStr(uint8_t month)
{
for (int i=0; i < dt_SHORT_STR_LEN; i++)
buffer[i] = pgm_read_byte(&(monthShortNames_P[i+ (month*dt_SHORT_STR_LEN)]));
buffer[dt_SHORT_STR_LEN] = 0;
return buffer;
}
char* dayStr(uint8_t day)
{
strcpy_P(buffer, (PGM_P)pgm_read_word(&(dayNames_P[day])));
return buffer;
}
char* dayShortStr(uint8_t day)
{
uint8_t index = day*dt_SHORT_STR_LEN;
for (int i=0; i < dt_SHORT_STR_LEN; i++)
buffer[i] = pgm_read_byte(&(dayShortNames_P[index + i]));
buffer[dt_SHORT_STR_LEN] = 0;
return buffer;
}
//====================================================================
/*
time.c - low level time and date functions
Copyright (c) Michael Margolis 2009-2014
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
1.0 6 Jan 2010 - initial release
1.1 12 Feb 2010 - fixed leap year calculation error
1.2 1 Nov 2010 - fixed setTime bug (thanks to Korman for this)
1.3 24 Mar 2012 - many edits by Paul Stoffregen: fixed timeStatus() to update
status, updated examples for Arduino 1.0, fixed ARM
compatibility issues, added TimeArduinoDue and TimeTeensy3
examples, add error checking and messages to RTC examples,
add examples to DS1307RTC library.
1.4 5 Sep 2014 - compatibility with Arduino 1.5.7
*/
#if ARDUINO >= 100
#include <Arduino.h>
#else
#include <WProgram.h>
#endif
#include "TimeLib.h"
static tmElements_t tm; // a cache of time elements
static time_t cacheTime; // the time the cache was updated
static uint32_t syncInterval = 300; // time sync will be attempted after this many seconds
void refreshCache(time_t t) {
if (t != cacheTime) {
breakTime(t, tm);
cacheTime = t;
}
}
int hour() { // the hour now
return hour(now());
}
int hour(time_t t) { // the hour for the given time
refreshCache(t);
return tm.Hour;
}
int hourFormat12() { // the hour now in 12 hour format
return hourFormat12(now());
}
int hourFormat12(time_t t) { // the hour for the given time in 12 hour format
refreshCache(t);
if( tm.Hour == 0 )
return 12; // 12 midnight
else if( tm.Hour > 12)
return tm.Hour - 12 ;
else
return tm.Hour ;
}
uint8_t isAM() { // returns true if time now is AM
return !isPM(now());
}
uint8_t isAM(time_t t) { // returns true if given time is AM
return !isPM(t);
}
uint8_t isPM() { // returns true if PM
return isPM(now());
}
uint8_t isPM(time_t t) { // returns true if PM
return (hour(t) >= 12);
}
int minute() {
return minute(now());
}
int minute(time_t t) { // the minute for the given time
refreshCache(t);
return tm.Minute;
}
int second() {
return second(now());
}
int second(time_t t) { // the second for the given time
refreshCache(t);
return tm.Second;
}
int day(){
return(day(now()));
}
int day(time_t t) { // the day for the given time (0-6)
refreshCache(t);
return tm.Day;
}
int weekday() { // Sunday is day 1
return weekday(now());
}
int weekday(time_t t) {
refreshCache(t);
return tm.Wday;
}
int month(){
return month(now());
}
int month(time_t t) { // the month for the given time
refreshCache(t);
return tm.Month;
}
int year() { // as in Processing, the full four digit year: (2009, 2010 etc)
return year(now());
}
int year(time_t t) { // the year for the given time
refreshCache(t);
return tmYearToCalendar(tm.Year);
}
/*============================================================================*/
/* functions to convert to and from system time */
/* These are for interfacing with time serivces and are not normally needed in a sketch */
// leap year calulator expects year argument as years offset from 1970
#define LEAP_YEAR(Y) ( ((1970+Y)>0) && !((1970+Y)%4) && ( ((1970+Y)%100) || !((1970+Y)%400) ) )
static const uint8_t monthDays[]={31,28,31,30,31,30,31,31,30,31,30,31}; // API starts months from 1, this array starts from 0
void breakTime(time_t timeInput, tmElements_t &tm){
// break the given time_t into time components
// this is a more compact version of the C library localtime function
// note that year is offset from 1970 !!!
uint8_t year;
uint8_t month, monthLength;
uint32_t time;
unsigned long days;
time = (uint32_t)timeInput;
tm.Second = time % 60;
time /= 60; // now it is minutes
tm.Minute = time % 60;
time /= 60; // now it is hours
tm.Hour = time % 24;
time /= 24; // now it is days
tm.Wday = ((time + 4) % 7) + 1; // Sunday is day 1
year = 0;
days = 0;
while((unsigned)(days += (LEAP_YEAR(year) ? 366 : 365)) <= time) {
year++;
}
tm.Year = year; // year is offset from 1970
days -= LEAP_YEAR(year) ? 366 : 365;
time -= days; // now it is days in this year, starting at 0
days=0;
month=0;
monthLength=0;
for (month=0; month<12; month++) {
if (month==1) { // february
if (LEAP_YEAR(year)) {
monthLength=29;
} else {
monthLength=28;
}
} else {
monthLength = monthDays[month];
}
if (time >= monthLength) {
time -= monthLength;
} else {
break;
}
}
tm.Month = month + 1; // jan is month 1
tm.Day = time + 1; // day of month
}
time_t makeTime(tmElements_t &tm){
// assemble time elements into time_t
// note year argument is offset from 1970 (see macros in time.h to convert to other formats)
// previous version used full four digit year (or digits since 2000),i.e. 2009 was 2009 or 9
int i;
uint32_t seconds;
// seconds from 1970 till 1 jan 00:00:00 of the given year
seconds= tm.Year*(SECS_PER_DAY * 365);
for (i = 0; i < tm.Year; i++) {
if (LEAP_YEAR(i)) {
seconds += SECS_PER_DAY; // add extra days for leap years
}
}
// add days for this year, months start from 1
for (i = 1; i < tm.Month; i++) {
if ( (i == 2) && LEAP_YEAR(tm.Year)) {
seconds += SECS_PER_DAY * 29;
} else {
seconds += SECS_PER_DAY * monthDays[i-1]; //monthDay array starts from 0
}
}
seconds+= (tm.Day-1) * SECS_PER_DAY;
seconds+= tm.Hour * SECS_PER_HOUR;
seconds+= tm.Minute * SECS_PER_MIN;
seconds+= tm.Second;
return (time_t)seconds;
}
/*=====================================================*/
/* Low level system time functions */
static uint32_t sysTime = 0;
static uint32_t prevMillis = 0;
static uint32_t nextSyncTime = 0;
static timeStatus_t Status = timeNotSet;
getExternalTime getTimePtr; // pointer to external sync function
//setExternalTime setTimePtr; // not used in this version
#ifdef TIME_DRIFT_INFO // define this to get drift data
time_t sysUnsyncedTime = 0; // the time sysTime unadjusted by sync
#endif
time_t now() {
// calculate number of seconds passed since last call to now()
while (millis() - prevMillis >= 1000) {
// millis() and prevMillis are both unsigned ints thus the subtraction will always be the absolute value of the difference
sysTime++;
prevMillis += 1000;
#ifdef TIME_DRIFT_INFO
sysUnsyncedTime++; // this can be compared to the synced time to measure long term drift
#endif
}
if (nextSyncTime <= sysTime) {
if (getTimePtr != 0) {
time_t t = getTimePtr();
if (t != 0) {
setTime(t);
} else {
nextSyncTime = sysTime + syncInterval;
Status = (Status == timeNotSet) ? timeNotSet : timeNeedsSync;
}
}
}
return (time_t)sysTime;
}
void setTime(time_t t) {
#ifdef TIME_DRIFT_INFO
if(sysUnsyncedTime == 0)
sysUnsyncedTime = t; // store the time of the first call to set a valid Time
#endif
sysTime = (uint32_t)t;
nextSyncTime = (uint32_t)t + syncInterval;
Status = timeSet;
prevMillis = millis(); // restart counting from now (thanks to Korman for this fix)
}
void setTime(int hr,int min,int sec,int dy, int mnth, int yr){
// year can be given as full four digit year or two digts (2010 or 10 for 2010);
//it is converted to years since 1970
if( yr > 99)
yr = yr - 1970;
else
yr += 30;
tm.Year = yr;
tm.Month = mnth;
tm.Day = dy;
tm.Hour = hr;
tm.Minute = min;
tm.Second = sec;
setTime(makeTime(tm));
}
void adjustTime(long adjustment) {
sysTime += adjustment;
}
// indicates if time has been set and recently synchronized
timeStatus_t timeStatus() {
now(); // required to actually update the status
return Status;
}
void setSyncProvider( getExternalTime getTimeFunction){
getTimePtr = getTimeFunction;
nextSyncTime = sysTime;
now(); // this will sync the clock
}
void setSyncInterval(time_t interval){ // set the number of seconds between re-sync
syncInterval = (uint32_t)interval;
nextSyncTime = sysTime + syncInterval;
}
//=====================================================================
#include "TimeLib.h"
//====================================================================
/*
time.h - low level time and date functions
*/
/*
July 3 2011 - fixed elapsedSecsThisWeek macro (thanks Vincent Valdy for this)
- fixed daysToTime_t macro (thanks maniacbug)
*/
#ifndef _Time_h
#ifdef __cplusplus
#define _Time_h
#include <inttypes.h>
#ifndef __AVR__
#include <sys/types.h> // for __time_t_defined, but avr libc lacks sys/types.h
#endif
#if !defined(__time_t_defined) // avoid conflict with newlib or other posix libc
typedef unsigned long time_t;
#endif
// This ugly hack allows us to define C++ overloaded functions, when included
// from within an extern "C", as newlib's sys/stat.h does. Actually it is
// intended to include "time.h" from the C library (on ARM, but AVR does not
// have that file at all). On Mac and Windows, the compiler will find this
// "Time.h" instead of the C library "time.h", so we may cause other weird
// and unpredictable effects by conflicting with the C library header "time.h",
// but at least this hack lets us define C++ functions as intended. Hopefully
// nothing too terrible will result from overriding the C library header?!
extern "C++" {
typedef enum {timeNotSet, timeNeedsSync, timeSet
} timeStatus_t ;
typedef enum {
dowInvalid, dowSunday, dowMonday, dowTuesday, dowWednesday, dowThursday, dowFriday, dowSaturday
} timeDayOfWeek_t;
typedef enum {
tmSecond, tmMinute, tmHour, tmWday, tmDay,tmMonth, tmYear, tmNbrFields
} tmByteFields;
typedef struct {
uint8_t Second;
uint8_t Minute;
uint8_t Hour;
uint8_t Wday; // day of week, sunday is day 1
uint8_t Day;
uint8_t Month;
uint8_t Year; // offset from 1970;
} tmElements_t, TimeElements, *tmElementsPtr_t;
//convenience macros to convert to and from tm years
#define tmYearToCalendar(Y) ((Y) + 1970) // full four digit year
#define CalendarYrToTm(Y) ((Y) - 1970)
#define tmYearToY2k(Y) ((Y) - 30) // offset is from 2000
#define y2kYearToTm(Y) ((Y) + 30)
typedef time_t(*getExternalTime)();
//typedef void (*setExternalTime)(const time_t); // not used in this version
/*==============================================================================*/
/* Useful Constants */
#define SECS_PER_MIN ((time_t)(60UL))
#define SECS_PER_HOUR ((time_t)(3600UL))
#define SECS_PER_DAY ((time_t)(SECS_PER_HOUR * 24UL))
#define DAYS_PER_WEEK ((time_t)(7UL))
#define SECS_PER_WEEK ((time_t)(SECS_PER_DAY * DAYS_PER_WEEK))
#define SECS_PER_YEAR ((time_t)(SECS_PER_WEEK * 52UL))
#define SECS_YR_2000 ((time_t)(946684800UL)) // the time at the start of y2k
/* Useful Macros for getting elapsed time */
#define numberOfSeconds(_time_) (_time_ % SECS_PER_MIN)
#define numberOfMinutes(_time_) ((_time_ / SECS_PER_MIN) % SECS_PER_MIN)
#define numberOfHours(_time_) (( _time_% SECS_PER_DAY) / SECS_PER_HOUR)
#define dayOfWeek(_time_) ((( _time_ / SECS_PER_DAY + 4) % DAYS_PER_WEEK)+1) // 1 = Sunday
#define elapsedDays(_time_) ( _time_ / SECS_PER_DAY) // this is number of days since Jan 1 1970
#define elapsedSecsToday(_time_) (_time_ % SECS_PER_DAY) // the number of seconds since last midnight
// The following macros are used in calculating alarms and assume the clock is set to a date later than Jan 1 1971
// Always set the correct time before settting alarms
#define previousMidnight(_time_) (( _time_ / SECS_PER_DAY) * SECS_PER_DAY) // time at the start of the given day
#define nextMidnight(_time_) ( previousMidnight(_time_) + SECS_PER_DAY ) // time at the end of the given day
#define elapsedSecsThisWeek(_time_) (elapsedSecsToday(_time_) + ((dayOfWeek(_time_)-1) * SECS_PER_DAY) ) // note that week starts on day 1
#define previousSunday(_time_) (_time_ - elapsedSecsThisWeek(_time_)) // time at the start of the week for the given time
#define nextSunday(_time_) ( previousSunday(_time_)+SECS_PER_WEEK) // time at the end of the week for the given time
/* Useful Macros for converting elapsed time to a time_t */
#define minutesToTime_t ((M)) ( (M) * SECS_PER_MIN)
#define hoursToTime_t ((H)) ( (H) * SECS_PER_HOUR)
#define daysToTime_t ((D)) ( (D) * SECS_PER_DAY) // fixed on Jul 22 2011
#define weeksToTime_t ((W)) ( (W) * SECS_PER_WEEK)
/*============================================================================*/
/* time and date functions */
int hour(); // the hour now
int hour(time_t t); // the hour for the given time
int hourFormat12(); // the hour now in 12 hour format
int hourFormat12(time_t t); // the hour for the given time in 12 hour format
uint8_t isAM(); // returns true if time now is AM
uint8_t isAM(time_t t); // returns true the given time is AM
uint8_t isPM(); // returns true if time now is PM
uint8_t isPM(time_t t); // returns true the given time is PM
int minute(); // the minute now
int minute(time_t t); // the minute for the given time
int second(); // the second now
int second(time_t t); // the second for the given time
int day(); // the day now
int day(time_t t); // the day for the given time
int weekday(); // the weekday now (Sunday is day 1)
int weekday(time_t t); // the weekday for the given time
int month(); // the month now (Jan is month 1)
int month(time_t t); // the month for the given time
int year(); // the full four digit year: (2009, 2010 etc)
int year(time_t t); // the year for the given time
time_t now(); // return the current time as seconds since Jan 1 1970
void setTime(time_t t);
void setTime(int hr,int min,int sec,int day, int month, int yr);
void adjustTime(long adjustment);
/* date strings */
#define dt_MAX_STRING_LEN 9 // length of longest date string (excluding terminating null)
char* monthStr(uint8_t month);
char* dayStr(uint8_t day);
char* monthShortStr(uint8_t month);
char* dayShortStr(uint8_t day);
/* time sync functions */
timeStatus_t timeStatus(); // indicates if time has been set and recently synchronized
void setSyncProvider( getExternalTime getTimeFunction); // identify the external time provider
void setSyncInterval(time_t interval); // set the number of seconds between re-sync
/* low level functions to convert to and from system time */
void breakTime(time_t time, tmElements_t &tm); // break time_t into elements
time_t makeTime(tmElements_t &tm); // convert time elements into time_t
} // extern "C++"
#endif // __cplusplus
#endif /* _Time_h */
video: https://youtu.be/Zx7hk7hxabM
/*
* TimeNTP_ESP8266WiFi.ino
* Example showing time sync to NTP time source
*
* This sketch uses the ESP8266WiFi library
*/
#include "TimeLib.h"
#include <ESP8266WiFi.h>
#include <WiFiUdp.h>
const char ssid[] = "xxxx"; // your network SSID (name)
const char pass[] = "xxxxxxxxx"; // your network password
/*
// NTP Servers:
//static const char ntpServerName[] = "us.pool.ntp.org";
//static const char ntpServerName[] = "time.nist.gov";
//static const char ntpServerName[] = "time-a.timefreq.bldrdoc.gov";
//static const char ntpServerName[] = "time-b.timefreq.bldrdoc.gov";
//static const char ntpServerName[] = "time-c.timefreq.bldrdoc.gov";
*/
// NTP Servers:
const char * ntpServerName;
String ntpServerName1 = "us.pool.ntp.org";
String ntpServerName2 = "time.nist.gov";
String ntpServerName3 = "time-a.timefreq.bldrdoc.gov";
String ntpServerName4 = "time-b.timefreq.bldrdoc.gov";
String ntpServerName5 = "time-c.timefreq.bldrdoc.gov";
const int timeZone = 5; // Indian Time Zone (+5.30)
//const int timeZone = -5; // Eastern Standard Time (USA)
//const int timeZone = -4; // Eastern Daylight Time (USA)
//const int timeZone = -8; // Pacific Standard Time (USA)
//const int timeZone = -7; // Pacific Daylight Time (USA)
WiFiUDP Udp;
unsigned int localPort = 8888; // local port to listen for UDP packets
time_t getNtpTime();
void digitalClockDisplay();
void printDigits(int digits);
void sendNTPpacket(IPAddress &address);
int Status=0;
void setup()
{
Serial.begin(115200);
while (!Serial) ; // Needed for Leonardo only
delay(250);
Serial.println("TimeNTP Example");
Serial.print("Connecting to ");
Serial.println(ssid);
WiFi.begin(ssid, pass);
while (WiFi.status() != WL_CONNECTED){
delay(500);
Serial.print(".");
}
for(int Loop=0;Loop<5;Loop++)
{
if(Loop==0) ntpServerName = ntpServerName1.c_str();
if(Loop==1) ntpServerName = ntpServerName2.c_str();
if(Loop==2) ntpServerName = ntpServerName3.c_str();
if(Loop==3) ntpServerName = ntpServerName4.c_str();
if(Loop==4) ntpServerName = ntpServerName5.c_str();
Serial.print("IP number assigned by DHCP is ");
Serial.println(WiFi.localIP());
Serial.println("Starting UDP");
Udp.begin(localPort);
Serial.print("Local port: ");
Serial.println(Udp.localPort());
Serial.println("waiting for sync");
setSyncProvider(getNtpTime);
setSyncInterval(300);
if(Status==1){
if(Loop==0) Serial.println("Ressponse from URL 1");
if(Loop==1) Serial.println("Ressponse from URL 2");
if(Loop==2) Serial.println("Ressponse from URL 3");
if(Loop==3) Serial.println("Ressponse from URL 4");
if(Loop==4) Serial.println("Ressponse from URL 5");
break;
}
}
}
time_t prevDisplay = 0; // when the digital clock was displayed
int ADC_Values=0;
int ADC_Count=0;
int ADC_Sum=0;
int check=0;
void loop()
{
if(timeStatus()!=timeNotSet)
{
if(now()!= prevDisplay){ //update the display only if time has changed
prevDisplay = now();
digitalClockDisplay();
/*
ADC_Sum+=analogRead(A0);ADC_Count++;
if(ADC_Values==0)
{
ADC_Values=ADC_Values=(int)(4200*((ADC_Sum/ADC_Count)/1024.0));
check=(ADC_Values/10)%10;
ADC_Values=ADC_Values/100;
if(check>=5)ADC_Values++;
Serial.print("Battery: ");
Serial.print(ADC_Values/10);
Serial.print(".");
Serial.print(ADC_Values%10);
Serial.println(" V");
}
if(ADC_Count>=10)
{
//Serial.print("Adc Values: ");
//Serial.println(ADC_Values);
ADC_Values=(int)(4200*((ADC_Sum/ADC_Count)/1024.0));
Serial.print("Battery: ");
Serial.print(ADC_Values);
Serial.println(" mV");
check=(ADC_Values/10)%10;
ADC_Values=ADC_Values/100;
if(check>=5)ADC_Values++;
Serial.print("Battery: ");
Serial.print(ADC_Values/10);
Serial.print(".");
Serial.print(ADC_Values%10);
Serial.println(" V"); ADC_Count=0;ADC_Sum=0;
}*/
}
}
}
String validPacket = "Time:";
void digitalClockDisplay()
{
// digital clock display of the time
Serial.print("DATE:");
Serial.print(day());
Serial.print(".");
Serial.print(month());
Serial.print(".");
Serial.print(year());
Serial.println();
Serial.print("TIME:");
Serial.print(hour());
printDigits(minute());
printDigits(second());
Serial.println(" ");
Serial.println(" ");
}
void printDigits(int digits)
{
// utility for digital clock display: prints preceding colon and leading 0
Serial.print(":");
if (digits < 10)
Serial.print('0');
Serial.print(digits);
}
/*-------- NTP code ----------*/
const int NTP_PACKET_SIZE = 48; // NTP time is in the first 48 bytes of message
byte packetBuffer[NTP_PACKET_SIZE]; //buffer to hold incoming & outgoing packets
time_t getNtpTime()
{
IPAddress ntpServerIP; // NTP server's ip address
while (Udp.parsePacket() > 0) ; // discard any previously received packets
Serial.println("Transmit NTP Request");
// get a random server from the pool
WiFi.hostByName(ntpServerName, ntpServerIP);
Serial.print(ntpServerName);
Serial.print(": ");
Serial.println(ntpServerIP);
sendNTPpacket(ntpServerIP);
uint32_t beginWait = millis();
while (millis() - beginWait < 1500) {
int size = Udp.parsePacket();
if (size >= NTP_PACKET_SIZE) {
Serial.println("Receive NTP Response");
Udp.read(packetBuffer, NTP_PACKET_SIZE); // read packet into the buffer
unsigned long secsSince1900;
// convert four bytes starting at location 40 to a long integer
secsSince1900 = (unsigned long)packetBuffer[40] << 24;
secsSince1900 |= (unsigned long)packetBuffer[41] << 16;
secsSince1900 |= (unsigned long)packetBuffer[42] << 8;
secsSince1900 |= (unsigned long)packetBuffer[43];Status=1;
return (secsSince1900 - 2208988800UL + timeZone * SECS_PER_HOUR)+1800;
}
}
Serial.println("No NTP Response :-(");Status=0;
return 0; // return 0 if unable to get the time
}
// send an NTP request to the time server at the given address
void sendNTPpacket(IPAddress &address)
{
// set all bytes in the buffer to 0
memset(packetBuffer, 0, NTP_PACKET_SIZE);
// Initialize values needed to form NTP request
// (see URL above for details on the packets)
packetBuffer[0] = 0b11100011; // LI, Version, Mode
packetBuffer[1] = 0; // Stratum, or type of clock
packetBuffer[2] = 6; // Polling Interval
packetBuffer[3] = 0xEC; // Peer Clock Precision
// 8 bytes of zero for Root Delay & Root Dispersion
packetBuffer[12] = 49;
packetBuffer[13] = 0x4E;
packetBuffer[14] = 49;
packetBuffer[15] = 52;
// all NTP fields have been given values, now
// you can send a packet requesting a timestamp:
Udp.beginPacket(address, 123); //NTP requests are to port 123
Udp.write(packetBuffer, NTP_PACKET_SIZE);
Udp.endPacket();
}
//=======================================================================
/* DateStrings.cpp
* Definitions for date strings for use with the Time library
*
* Updated for Arduino 1.5.7 18 July 2014
*
* No memory is consumed in the sketch if your code does not call any of the string methods
* You can change the text of the strings, make sure the short strings are each exactly 3 characters
* the long strings can be any length up to the constant dt_MAX_STRING_LEN defined in TimeLib.h
*
*/
#if defined(__AVR__)
#include <avr/pgmspace.h>
#else
// for compatiblity with Arduino Due and Teensy 3.0 and maybe others?
#define PROGMEM
#define PGM_P const char *
#define pgm_read_byte(addr) (*(const unsigned char *)(addr))
#define pgm_read_word(addr) (*(const unsigned char **)(addr))
#define strcpy_P(dest, src) strcpy((dest), (src))
#endif
#include <string.h> // for strcpy_P or strcpy
#include "TimeLib.h"
// the short strings for each day or month must be exactly dt_SHORT_STR_LEN
#define dt_SHORT_STR_LEN 3 // the length of short strings
static char buffer[dt_MAX_STRING_LEN+1]; // must be big enough for longest string and the terminating null
const char monthStr0[] PROGMEM = "";
const char monthStr1[] PROGMEM = "January";
const char monthStr2[] PROGMEM = "February";
const char monthStr3[] PROGMEM = "March";
const char monthStr4[] PROGMEM = "April";
const char monthStr5[] PROGMEM = "May";
const char monthStr6[] PROGMEM = "June";
const char monthStr7[] PROGMEM = "July";
const char monthStr8[] PROGMEM = "August";
const char monthStr9[] PROGMEM = "September";
const char monthStr10[] PROGMEM = "October";
const char monthStr11[] PROGMEM = "November";
const char monthStr12[] PROGMEM = "December";
const PROGMEM char * const PROGMEM monthNames_P[] =
{
monthStr0,monthStr1,monthStr2,monthStr3,monthStr4,monthStr5,monthStr6,
monthStr7,monthStr8,monthStr9,monthStr10,monthStr11,monthStr12
};
const char monthShortNames_P[] PROGMEM = "ErrJanFebMarAprMayJunJulAugSepOctNovDec";
const char dayStr0[] PROGMEM = "Err";
const char dayStr1[] PROGMEM = "Sunday";
const char dayStr2[] PROGMEM = "Monday";
const char dayStr3[] PROGMEM = "Tuesday";
const char dayStr4[] PROGMEM = "Wednesday";
const char dayStr5[] PROGMEM = "Thursday";
const char dayStr6[] PROGMEM = "Friday";
const char dayStr7[] PROGMEM = "Saturday";
const PROGMEM char * const PROGMEM dayNames_P[] =
{
dayStr0,dayStr1,dayStr2,dayStr3,dayStr4,dayStr5,dayStr6,dayStr7
};
const char dayShortNames_P[] PROGMEM = "ErrSunMonTueWedThuFriSat";
/* functions to return date strings */
char* monthStr(uint8_t month)
{
strcpy_P(buffer, (PGM_P)pgm_read_word(&(monthNames_P[month])));
return buffer;
}
char* monthShortStr(uint8_t month)
{
for (int i=0; i < dt_SHORT_STR_LEN; i++)
buffer[i] = pgm_read_byte(&(monthShortNames_P[i+ (month*dt_SHORT_STR_LEN)]));
buffer[dt_SHORT_STR_LEN] = 0;
return buffer;
}
char* dayStr(uint8_t day)
{
strcpy_P(buffer, (PGM_P)pgm_read_word(&(dayNames_P[day])));
return buffer;
}
char* dayShortStr(uint8_t day)
{
uint8_t index = day*dt_SHORT_STR_LEN;
for (int i=0; i < dt_SHORT_STR_LEN; i++)
buffer[i] = pgm_read_byte(&(dayShortNames_P[index + i]));
buffer[dt_SHORT_STR_LEN] = 0;
return buffer;
}
//====================================================================
/*
time.c - low level time and date functions
Copyright (c) Michael Margolis 2009-2014
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
1.0 6 Jan 2010 - initial release
1.1 12 Feb 2010 - fixed leap year calculation error
1.2 1 Nov 2010 - fixed setTime bug (thanks to Korman for this)
1.3 24 Mar 2012 - many edits by Paul Stoffregen: fixed timeStatus() to update
status, updated examples for Arduino 1.0, fixed ARM
compatibility issues, added TimeArduinoDue and TimeTeensy3
examples, add error checking and messages to RTC examples,
add examples to DS1307RTC library.
1.4 5 Sep 2014 - compatibility with Arduino 1.5.7
*/
#if ARDUINO >= 100
#include <Arduino.h>
#else
#include <WProgram.h>
#endif
#include "TimeLib.h"
static tmElements_t tm; // a cache of time elements
static time_t cacheTime; // the time the cache was updated
static uint32_t syncInterval = 300; // time sync will be attempted after this many seconds
void refreshCache(time_t t) {
if (t != cacheTime) {
breakTime(t, tm);
cacheTime = t;
}
}
int hour() { // the hour now
return hour(now());
}
int hour(time_t t) { // the hour for the given time
refreshCache(t);
return tm.Hour;
}
int hourFormat12() { // the hour now in 12 hour format
return hourFormat12(now());
}
int hourFormat12(time_t t) { // the hour for the given time in 12 hour format
refreshCache(t);
if( tm.Hour == 0 )
return 12; // 12 midnight
else if( tm.Hour > 12)
return tm.Hour - 12 ;
else
return tm.Hour ;
}
uint8_t isAM() { // returns true if time now is AM
return !isPM(now());
}
uint8_t isAM(time_t t) { // returns true if given time is AM
return !isPM(t);
}
uint8_t isPM() { // returns true if PM
return isPM(now());
}
uint8_t isPM(time_t t) { // returns true if PM
return (hour(t) >= 12);
}
int minute() {
return minute(now());
}
int minute(time_t t) { // the minute for the given time
refreshCache(t);
return tm.Minute;
}
int second() {
return second(now());
}
int second(time_t t) { // the second for the given time
refreshCache(t);
return tm.Second;
}
int day(){
return(day(now()));
}
int day(time_t t) { // the day for the given time (0-6)
refreshCache(t);
return tm.Day;
}
int weekday() { // Sunday is day 1
return weekday(now());
}
int weekday(time_t t) {
refreshCache(t);
return tm.Wday;
}
int month(){
return month(now());
}
int month(time_t t) { // the month for the given time
refreshCache(t);
return tm.Month;
}
int year() { // as in Processing, the full four digit year: (2009, 2010 etc)
return year(now());
}
int year(time_t t) { // the year for the given time
refreshCache(t);
return tmYearToCalendar(tm.Year);
}
/*============================================================================*/
/* functions to convert to and from system time */
/* These are for interfacing with time serivces and are not normally needed in a sketch */
// leap year calulator expects year argument as years offset from 1970
#define LEAP_YEAR(Y) ( ((1970+Y)>0) && !((1970+Y)%4) && ( ((1970+Y)%100) || !((1970+Y)%400) ) )
static const uint8_t monthDays[]={31,28,31,30,31,30,31,31,30,31,30,31}; // API starts months from 1, this array starts from 0
void breakTime(time_t timeInput, tmElements_t &tm){
// break the given time_t into time components
// this is a more compact version of the C library localtime function
// note that year is offset from 1970 !!!
uint8_t year;
uint8_t month, monthLength;
uint32_t time;
unsigned long days;
time = (uint32_t)timeInput;
tm.Second = time % 60;
time /= 60; // now it is minutes
tm.Minute = time % 60;
time /= 60; // now it is hours
tm.Hour = time % 24;
time /= 24; // now it is days
tm.Wday = ((time + 4) % 7) + 1; // Sunday is day 1
year = 0;
days = 0;
while((unsigned)(days += (LEAP_YEAR(year) ? 366 : 365)) <= time) {
year++;
}
tm.Year = year; // year is offset from 1970
days -= LEAP_YEAR(year) ? 366 : 365;
time -= days; // now it is days in this year, starting at 0
days=0;
month=0;
monthLength=0;
for (month=0; month<12; month++) {
if (month==1) { // february
if (LEAP_YEAR(year)) {
monthLength=29;
} else {
monthLength=28;
}
} else {
monthLength = monthDays[month];
}
if (time >= monthLength) {
time -= monthLength;
} else {
break;
}
}
tm.Month = month + 1; // jan is month 1
tm.Day = time + 1; // day of month
}
time_t makeTime(tmElements_t &tm){
// assemble time elements into time_t
// note year argument is offset from 1970 (see macros in time.h to convert to other formats)
// previous version used full four digit year (or digits since 2000),i.e. 2009 was 2009 or 9
int i;
uint32_t seconds;
// seconds from 1970 till 1 jan 00:00:00 of the given year
seconds= tm.Year*(SECS_PER_DAY * 365);
for (i = 0; i < tm.Year; i++) {
if (LEAP_YEAR(i)) {
seconds += SECS_PER_DAY; // add extra days for leap years
}
}
// add days for this year, months start from 1
for (i = 1; i < tm.Month; i++) {
if ( (i == 2) && LEAP_YEAR(tm.Year)) {
seconds += SECS_PER_DAY * 29;
} else {
seconds += SECS_PER_DAY * monthDays[i-1]; //monthDay array starts from 0
}
}
seconds+= (tm.Day-1) * SECS_PER_DAY;
seconds+= tm.Hour * SECS_PER_HOUR;
seconds+= tm.Minute * SECS_PER_MIN;
seconds+= tm.Second;
return (time_t)seconds;
}
/*=====================================================*/
/* Low level system time functions */
static uint32_t sysTime = 0;
static uint32_t prevMillis = 0;
static uint32_t nextSyncTime = 0;
static timeStatus_t Status = timeNotSet;
getExternalTime getTimePtr; // pointer to external sync function
//setExternalTime setTimePtr; // not used in this version
#ifdef TIME_DRIFT_INFO // define this to get drift data
time_t sysUnsyncedTime = 0; // the time sysTime unadjusted by sync
#endif
time_t now() {
// calculate number of seconds passed since last call to now()
while (millis() - prevMillis >= 1000) {
// millis() and prevMillis are both unsigned ints thus the subtraction will always be the absolute value of the difference
sysTime++;
prevMillis += 1000;
#ifdef TIME_DRIFT_INFO
sysUnsyncedTime++; // this can be compared to the synced time to measure long term drift
#endif
}
if (nextSyncTime <= sysTime) {
if (getTimePtr != 0) {
time_t t = getTimePtr();
if (t != 0) {
setTime(t);
} else {
nextSyncTime = sysTime + syncInterval;
Status = (Status == timeNotSet) ? timeNotSet : timeNeedsSync;
}
}
}
return (time_t)sysTime;
}
void setTime(time_t t) {
#ifdef TIME_DRIFT_INFO
if(sysUnsyncedTime == 0)
sysUnsyncedTime = t; // store the time of the first call to set a valid Time
#endif
sysTime = (uint32_t)t;
nextSyncTime = (uint32_t)t + syncInterval;
Status = timeSet;
prevMillis = millis(); // restart counting from now (thanks to Korman for this fix)
}
void setTime(int hr,int min,int sec,int dy, int mnth, int yr){
// year can be given as full four digit year or two digts (2010 or 10 for 2010);
//it is converted to years since 1970
if( yr > 99)
yr = yr - 1970;
else
yr += 30;
tm.Year = yr;
tm.Month = mnth;
tm.Day = dy;
tm.Hour = hr;
tm.Minute = min;
tm.Second = sec;
setTime(makeTime(tm));
}
void adjustTime(long adjustment) {
sysTime += adjustment;
}
// indicates if time has been set and recently synchronized
timeStatus_t timeStatus() {
now(); // required to actually update the status
return Status;
}
void setSyncProvider( getExternalTime getTimeFunction){
getTimePtr = getTimeFunction;
nextSyncTime = sysTime;
now(); // this will sync the clock
}
void setSyncInterval(time_t interval){ // set the number of seconds between re-sync
syncInterval = (uint32_t)interval;
nextSyncTime = sysTime + syncInterval;
}
//=====================================================================
#include "TimeLib.h"
//====================================================================
/*
time.h - low level time and date functions
*/
/*
July 3 2011 - fixed elapsedSecsThisWeek macro (thanks Vincent Valdy for this)
- fixed daysToTime_t macro (thanks maniacbug)
*/
#ifndef _Time_h
#ifdef __cplusplus
#define _Time_h
#include <inttypes.h>
#ifndef __AVR__
#include <sys/types.h> // for __time_t_defined, but avr libc lacks sys/types.h
#endif
#if !defined(__time_t_defined) // avoid conflict with newlib or other posix libc
typedef unsigned long time_t;
#endif
// This ugly hack allows us to define C++ overloaded functions, when included
// from within an extern "C", as newlib's sys/stat.h does. Actually it is
// intended to include "time.h" from the C library (on ARM, but AVR does not
// have that file at all). On Mac and Windows, the compiler will find this
// "Time.h" instead of the C library "time.h", so we may cause other weird
// and unpredictable effects by conflicting with the C library header "time.h",
// but at least this hack lets us define C++ functions as intended. Hopefully
// nothing too terrible will result from overriding the C library header?!
extern "C++" {
typedef enum {timeNotSet, timeNeedsSync, timeSet
} timeStatus_t ;
typedef enum {
dowInvalid, dowSunday, dowMonday, dowTuesday, dowWednesday, dowThursday, dowFriday, dowSaturday
} timeDayOfWeek_t;
typedef enum {
tmSecond, tmMinute, tmHour, tmWday, tmDay,tmMonth, tmYear, tmNbrFields
} tmByteFields;
typedef struct {
uint8_t Second;
uint8_t Minute;
uint8_t Hour;
uint8_t Wday; // day of week, sunday is day 1
uint8_t Day;
uint8_t Month;
uint8_t Year; // offset from 1970;
} tmElements_t, TimeElements, *tmElementsPtr_t;
//convenience macros to convert to and from tm years
#define tmYearToCalendar(Y) ((Y) + 1970) // full four digit year
#define CalendarYrToTm(Y) ((Y) - 1970)
#define tmYearToY2k(Y) ((Y) - 30) // offset is from 2000
#define y2kYearToTm(Y) ((Y) + 30)
typedef time_t(*getExternalTime)();
//typedef void (*setExternalTime)(const time_t); // not used in this version
/*==============================================================================*/
/* Useful Constants */
#define SECS_PER_MIN ((time_t)(60UL))
#define SECS_PER_HOUR ((time_t)(3600UL))
#define SECS_PER_DAY ((time_t)(SECS_PER_HOUR * 24UL))
#define DAYS_PER_WEEK ((time_t)(7UL))
#define SECS_PER_WEEK ((time_t)(SECS_PER_DAY * DAYS_PER_WEEK))
#define SECS_PER_YEAR ((time_t)(SECS_PER_WEEK * 52UL))
#define SECS_YR_2000 ((time_t)(946684800UL)) // the time at the start of y2k
/* Useful Macros for getting elapsed time */
#define numberOfSeconds(_time_) (_time_ % SECS_PER_MIN)
#define numberOfMinutes(_time_) ((_time_ / SECS_PER_MIN) % SECS_PER_MIN)
#define numberOfHours(_time_) (( _time_% SECS_PER_DAY) / SECS_PER_HOUR)
#define dayOfWeek(_time_) ((( _time_ / SECS_PER_DAY + 4) % DAYS_PER_WEEK)+1) // 1 = Sunday
#define elapsedDays(_time_) ( _time_ / SECS_PER_DAY) // this is number of days since Jan 1 1970
#define elapsedSecsToday(_time_) (_time_ % SECS_PER_DAY) // the number of seconds since last midnight
// The following macros are used in calculating alarms and assume the clock is set to a date later than Jan 1 1971
// Always set the correct time before settting alarms
#define previousMidnight(_time_) (( _time_ / SECS_PER_DAY) * SECS_PER_DAY) // time at the start of the given day
#define nextMidnight(_time_) ( previousMidnight(_time_) + SECS_PER_DAY ) // time at the end of the given day
#define elapsedSecsThisWeek(_time_) (elapsedSecsToday(_time_) + ((dayOfWeek(_time_)-1) * SECS_PER_DAY) ) // note that week starts on day 1
#define previousSunday(_time_) (_time_ - elapsedSecsThisWeek(_time_)) // time at the start of the week for the given time
#define nextSunday(_time_) ( previousSunday(_time_)+SECS_PER_WEEK) // time at the end of the week for the given time
/* Useful Macros for converting elapsed time to a time_t */
#define minutesToTime_t ((M)) ( (M) * SECS_PER_MIN)
#define hoursToTime_t ((H)) ( (H) * SECS_PER_HOUR)
#define daysToTime_t ((D)) ( (D) * SECS_PER_DAY) // fixed on Jul 22 2011
#define weeksToTime_t ((W)) ( (W) * SECS_PER_WEEK)
/*============================================================================*/
/* time and date functions */
int hour(); // the hour now
int hour(time_t t); // the hour for the given time
int hourFormat12(); // the hour now in 12 hour format
int hourFormat12(time_t t); // the hour for the given time in 12 hour format
uint8_t isAM(); // returns true if time now is AM
uint8_t isAM(time_t t); // returns true the given time is AM
uint8_t isPM(); // returns true if time now is PM
uint8_t isPM(time_t t); // returns true the given time is PM
int minute(); // the minute now
int minute(time_t t); // the minute for the given time
int second(); // the second now
int second(time_t t); // the second for the given time
int day(); // the day now
int day(time_t t); // the day for the given time
int weekday(); // the weekday now (Sunday is day 1)
int weekday(time_t t); // the weekday for the given time
int month(); // the month now (Jan is month 1)
int month(time_t t); // the month for the given time
int year(); // the full four digit year: (2009, 2010 etc)
int year(time_t t); // the year for the given time
time_t now(); // return the current time as seconds since Jan 1 1970
void setTime(time_t t);
void setTime(int hr,int min,int sec,int day, int month, int yr);
void adjustTime(long adjustment);
/* date strings */
#define dt_MAX_STRING_LEN 9 // length of longest date string (excluding terminating null)
char* monthStr(uint8_t month);
char* dayStr(uint8_t day);
char* monthShortStr(uint8_t month);
char* dayShortStr(uint8_t day);
/* time sync functions */
timeStatus_t timeStatus(); // indicates if time has been set and recently synchronized
void setSyncProvider( getExternalTime getTimeFunction); // identify the external time provider
void setSyncInterval(time_t interval); // set the number of seconds between re-sync
/* low level functions to convert to and from system time */
void breakTime(time_t time, tmElements_t &tm); // break time_t into elements
time_t makeTime(tmElements_t &tm); // convert time elements into time_t
} // extern "C++"
#endif // __cplusplus
#endif /* _Time_h */
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