Wish Time Library

[BaGRoS]

https://github.com/PaulStoffregen/Time

Time and time manipulation are very much needed in systems connected to the Internet. Every controller who has to turn something on or off at a specific time or time interval must be able to operate on time. We are a community from all over the world, so time zones also have a big influence.
Therefore, I believe that the library of this type should be placed as a flagship in the B4R installation.

 

[Erel]

I don't think that this library supports time zones.

 

[BaGRoS]

No, but support times, dates from second.

const int timeZone = 1; // Central European Time
//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)

[...]

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];
return secsSince1900 - 2208988800UL + timeZone * SECS_PER_HOUR;
}
}
Serial.println("No NTP Response :-(");
return 0; // return 0 if unable to get the time
}

https://github.com/PaulStoffregen/T...s/TimeNTP_ESP8266WiFi/TimeNTP_ESP8266WiFi.ino

 

[Erel]

If you ignore time zone differences, and especially DST effects, then all these calculations become quite simple.