Onnowpurbo: Created page with " /* NTP-TZ-DST NetWork Time Protocol - Time Zone - Daylight Saving Time This example shows how to read and set time, and how to use NTP (set NTP0_OR_LOCAL1 to..."

2019-09-27T02:12:09Z

Created page with " /* NTP-TZ-DST NetWork Time Protocol - Time Zone - Daylight Saving Time This example shows how to read and set time, and how to use NTP (set NTP0_OR_LOCAL1 to..."

New page

/*
NTP-TZ-DST
NetWork Time Protocol - Time Zone - Daylight Saving Time

This example shows how to read and set time,
and how to use NTP (set NTP0_OR_LOCAL1 to 0 below)
or an external RTC (set NTP0_OR_LOCAL1 to 1 below)

TZ and DST below have to be manually set
according to your local settings.

This example code is in the public domain.
*/

#include <ESP8266WiFi.h>
#include <time.h> // time() ctime()
#include <sys/time.h> // struct timeval
#include <coredecls.h> // settimeofday_cb()

////////////////////////////////////////////////////////

#ifndef STASSID
#define STASSID "ssidhotspot"
#define STAPSK "passwordhotspot"
#endif

#define SSID STASSID
#define SSIDPWD STAPSK
#define TZ 7 // (utc+) TZ in hours
#define DST_MN 60 // use 60mn for summer time in some countries

#define NTP0_OR_LOCAL1 1 // 0:use NTP 1:fake external RTC
#define RTC_TEST 1510592825 // 1510592825 = Monday 13 November 2017 17:07:05 UTC

////////////////////////////////////////////////////////

#define TZ_MN ((TZ)*60)
#define TZ_SEC ((TZ)*3600)
#define DST_SEC ((DST_MN)*60)

timeval cbtime; // time set in callback
bool cbtime_set = false;

void time_is_set(void) {
gettimeofday(&cbtime, NULL);
cbtime_set = true;
Serial.println("------------------ settimeofday() was called ------------------");
}

void setup() {
Serial.begin(115200);
settimeofday_cb(time_is_set);

#if NTP0_OR_LOCAL1
// local

ESP.eraseConfig();
time_t rtc = RTC_TEST;
timeval tv = { rtc, 0 };
timezone tz = { TZ_MN + DST_MN, 0 };
settimeofday(&tv, &tz);

#else // ntp

configTime(TZ_SEC, DST_SEC, "pool.ntp.org");
WiFi.mode(WIFI_STA);
WiFi.begin(SSID, SSIDPWD);
// don't wait, observe time changing when ntp timestamp is received

#endif // ntp
}

// for testing purpose:
extern "C" int clock_gettime(clockid_t unused, struct timespec *tp);

#define PTM(w) \
Serial.print(":" #w "="); \
Serial.print(tm->tm_##w);

void printTm(const char* what, const tm* tm) {
Serial.print(what);
PTM(isdst); PTM(yday); PTM(wday);
PTM(year); PTM(mon); PTM(mday);
PTM(hour); PTM(min); PTM(sec);
}

timeval tv;
timespec tp;
time_t now;
uint32_t now_ms, now_us;

void loop() {

gettimeofday(&tv, nullptr);
clock_gettime(0, &tp);
now = time(nullptr);
now_ms = millis();
now_us = micros();

// localtime / gmtime every second change
static time_t lastv = 0;
if (lastv != tv.tv_sec) {
lastv = tv.tv_sec;
Serial.println();
printTm("localtime", localtime(&now));
Serial.println();
printTm("gmtime ", gmtime(&now));
Serial.println();
Serial.println();
}

// time from boot
Serial.print("clock:");
Serial.print((uint32_t)tp.tv_sec);
Serial.print("/");
Serial.print((uint32_t)tp.tv_nsec);
Serial.print("ns");

// time from boot
Serial.print(" millis:");
Serial.print(now_ms);
Serial.print(" micros:");
Serial.print(now_us);

// EPOCH+tz+dst
Serial.print(" gtod:");
Serial.print((uint32_t)tv.tv_sec);
Serial.print("/");
Serial.print((uint32_t)tv.tv_usec);
Serial.print("us");

// EPOCH+tz+dst
Serial.print(" time:");
Serial.print((uint32_t)now);

// human readable
Serial.print(" ctime:(UTC+");
Serial.print((uint32_t)(TZ * 60 + DST_MN));
Serial.print("mn)");
Serial.print(ctime(&now));

// simple drifting loop
delay(1000);
}

==Pranala Menarik==

* [[WeMOS]]

WeMOS: NTP - Revision history

Onnowpurbo: Created page with " /* NTP-TZ-DST NetWork Time Protocol - Time Zone - Daylight Saving Time This example shows how to read and set time, and how to use NTP (set NTP0_OR_LOCAL1 to..."