Applying TImeZone functionality (ESP8266 Ntp )

[Cameron]

Hello!

I have the example working from the webpage working just fine. However, I am struggling to figure out how to apply the newly correct time to the system clock…

I am trying to get this newly formated time into my sketch, but no luck.

… Assume same code up to void loop…

I just don’t think I understand how to apply the tz.toLocal method on a time object. (See time_t current_time() )

My serial monitor output:

02/02/2021 15:19:15
MyCrummyCode:23:19:15 2.2.2021 Tuesday 

 

void loop() {
// I print the time from local clock but first I check DST
// to add hours if needed
	Serial.println(getEpochStringByParams(usPT.toLocal(now())));
	Serial.print("MyCrummyCode:");
	digitalClockDisplay();

	delay(1000);
}

tmElements_t tm;

time_t current_time() {
	return make_unixtime(usPT.toLocal(second()), usPT.toLocal(minute()),
			usPT.toLocal(hour()), usPT.toLocal(day()), usPT.toLocal(month()),
			usPT.toLocal(year()));
}

time_t make_unixtime(uint8_t sec, uint8_t mn, uint8_t hr, uint8_t dy,
		uint8_t mon, uint16_t yr) {
	tm.Second = sec;
	tm.Hour = hr;
	tm.Minute = mn;
	tm.Day = dy;
	tm.Month = mon;
	tm.Year = yr - 1970;
	return makeTime(tm);
}

void digitalClockDisplay() {
// digital clock display of the time
	if (DEBUG) {
		yield();
		Serial.print(hour());
		yield();
		printDigits(minute());
		yield();
		printDigits(second());
		yield();
		Serial.print(" ");
		yield();
		Serial.print(day());
		yield();
		Serial.print(".");
		yield();
		Serial.print(month());
		yield();
		Serial.print(".");
		yield();
		Serial.print(year());
		yield();
		Serial.print(" ");
		yield();
		Serial.println(dayStr(weekday()));
	}
}

void printDigits(int digits) {
// utility for digital clock display: prints preceding colon and leading 0
	yield();
	Serial.print(":");
	if (digits & lt; 10)
		Serial.print('0');
	yield();
	Serial.print(digits);
}

 

[Renzo Mischianti]

Hi Cameron,
I understand what you want to do, but It’s discouraged because you lost some information (GTM for example), but here the code modified.
I advise you to use strftime that offer a lot of features here a list.

I update local time directly when the value is returned because if you call the functione more than one time you apply N time the DST and you lost control of the time.

		unsigned long epoch = tz.toLocal(timeClient.getEpochTime());
		setTime(epoch);

and use a strftime like so

	Serial.println(getEpochStringByParams(now(), "%H:%M:%S %d.%m.%Y It's a beautiful %A of %B"));

and the complete sketch
pay attention I add my timezone:

/*
 * Simple NTP client update system time with DST applyed (discouraged)
 * http://mischianti.org/
 *
 * The MIT License (MIT)
 * written by Renzo Mischianti 
 */

#define DEBUG

const char *ssid = "";
const char *password = "";

#include 
// change next line to use with another board/shield
#include 
//#include  // for WiFi shield
//#include  // for WiFi 101 shield or MKR1000
#include 
#include 
#include 
#include     // https://github.com/JChristensen/Timezone

/**
 * Input time in epoch format and return tm time format
 * by Renzo Mischianti 
 */
static tm getDateTimeByParams(long time) {
	struct tm *newtime;
	const time_t tim = time;
	newtime = localtime(&tim);
	return *newtime;
}
/**
 * Input tm time format and return String with format pattern
 * by Renzo Mischianti 
 */
static String getDateTimeStringByParams(tm *newtime, char *pattern =
		(char*) "%d/%m/%Y %H:%M:%S") {
	char buffer[90];
	strftime(buffer, 90, pattern, newtime);
	return buffer;
}

/**
 * Input time in epoch format format and return String with format pattern
 * by Renzo Mischianti 
 */
static String getEpochStringByParams(long time, char *pattern =
		(char*) "%d/%m/%Y %H:%M:%S") {
//    struct tm *newtime;
	tm newtime;
	newtime = getDateTimeByParams(time);
	return getDateTimeStringByParams(&newtime, pattern);
}

WiFiUDP ntpUDP;

// By default 'pool.ntp.org' is used with 60 seconds update interval and
// no offset
// NTPClient timeClient(ntpUDP);

// You can specify the time server pool and the offset, (in seconds)
// additionaly you can specify the update interval (in milliseconds).
int GTMOffset = 0; // SET TO UTC TIME
NTPClient timeClient(ntpUDP, "europe.pool.ntp.org", GTMOffset * 60 * 60,
		60 * 60 * 1000);

// Central European Time (Frankfurt, Paris)
TimeChangeRule CEST = { "CEST", Last, Sun, Mar, 2, 120 }; // Central European Summer Time
TimeChangeRule CET = { "CET ", Last, Sun, Oct, 3, 60 }; // Central European Standard Time
Timezone tz(CEST, CET);


//// US Pacific Time Zone (Las Vegas, Los Angeles)
//TimeChangeRule usPDT = {"PDT", Second, Sun, Mar, 2, -420};
//TimeChangeRule usPST = {"PST", First, Sun, Nov, 2, -480};
//Timezone tz(usPDT, usPST);

void setup() {
	Serial.begin(115200);
	WiFi.begin(ssid, password);

	while (WiFi.status() != WL_CONNECTED) {
		delay(500);
		Serial.print(".");
	}

	timeClient.begin();
	delay(1000);
	if (timeClient.update()) {
		Serial.print("Adjust local clock");
//		unsigned long epoch = timeClient.getEpochTime();
		unsigned long epoch = tz.toLocal(timeClient.getEpochTime());
		setTime(epoch);
	} else {
		Serial.print("NTP Update not WORK!!");
	}

}


void loop() {
// I print the time from local clock but first I check DST
// to add hours if needed
//	Serial.println(getEpochStringByParams(tz.toLocal(now())));
	Serial.println(getEpochStringByParams(now(), "%H:%M:%S %d.%m.%Y It's a beautiful %A of %B"));
	Serial.print("MyCrummyCode:");
	digitalClockDisplay();

	delay(1000);
}

tmElements_t tm;

time_t current_time() {
	return make_unixtime(tz.toLocal(second()), tz.toLocal(minute()),
			tz.toLocal(hour()), tz.toLocal(day()), tz.toLocal(month()),
			tz.toLocal(year()));
}

time_t make_unixtime(uint8_t sec, uint8_t mn, uint8_t hr, uint8_t dy,
		uint8_t mon, uint16_t yr) {
	tm.Second = sec;
	tm.Hour = hr;
	tm.Minute = mn;
	tm.Day = dy;
	tm.Month = mon;
	tm.Year = yr - 1970;
	return makeTime(tm);
}

void digitalClockDisplay() {
// digital clock display of the time
#ifdef DEBUG
		yield();
		Serial.print(hour());
		yield();
		printDigits(minute());
		yield();
		printDigits(second());
		yield();
		Serial.print(" ");
		yield();
		Serial.print(day());
		yield();
		Serial.print(".");
		yield();
		Serial.print(month());
		yield();
		Serial.print(".");
		yield();
		Serial.print(year());
		yield();
		Serial.print(" ");
		yield();
		Serial.println(dayStr(weekday()));
#endif
}

void printDigits(int digits) {
// utility for digital clock display: prints preceding colon and leading 0
	yield();
	Serial.print(":");
	if (digits < 10)
		Serial.print('0');
	yield();
	Serial.print(digits);
}

and here the result

MyCrummyCode:7:26:58 3.2.2021 Wednesday
07:26:59 03.02.2021 It's a beautiful Wednesday of February
MyCrummyCode:7:26:59 3.2.2021 Wednesday
07:27:00 03.02.2021 It's a beautiful Wednesday of February
MyCrummyCode:7:27:00 3.2.2021 Wednesday
07:27:01 03.02.2021 It's a beautiful Wednesday of February
MyCrummyCode:7:27:01 3.2.2021 Wednesday
07:27:02 03.02.2021 It's a beautiful Wednesday of February
MyCrummyCode:7:27:02 3.2.2021 Wednesday
07:27:03 03.02.2021 It's a beautiful Wednesday of February
MyCrummyCode:7:27:03 3.2.2021 Wednesday

Bye Renzo

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