Day_light_offset for germany / Pass existing time as parameter?

[basementmedia2]

Hi mobitz,

i have two maybe stupid beginner questions:

First:
I live in germany so i guess i have to set gmt_offset to 1?
But what value do i have to set for day_light_offset? is there only 0 (no daylight saving) and 1?

Second question:
In this part of the example code:

session.time.ntp_server = "pool.ntp.org,time.nist.gov";
session.time.gmt_offset = 1;
session.time.day_light_offset = 1;

Is there a way to pass an already existing time and date as a parameter instead of requesting them again here?

Best wishes and thank you for this great library

[mobizt]

https://en.wikipedia.org/wiki/Daylight_saving_time

You can set or update your device time yourself using NTP server or RTC chip before calling smtp or imap connect without to set session.time.

[basementmedia2]

Ah, ok.

so i f i just comment these lines out (or delete them)

//session.time.ntp_server = "pool.ntp.org,time.nist.gov";
//session.time.gmt_offset = 1;
//session.time.day_light_offset = 1;

i am done?

Do i not have to do someting like this ?

session.time.hour = 10
session.time.minute = 25
session.time.second = 12
session.time.day = 8
session.time.month = 1
session.time.year= 2022

If yes how is the correct name of the parameters?

If No: How does the Email-Session know, where to get the time from?
I receive the current Time this way (shorted version)

#include <NTPtimeESP.h> 
NTPtime NTPch("pool.ntp.org"); 
char *ssid      = "";    
char *password  = "";   

strDateTime dateTime;

void setup() {
  Serial.begin(115200);
  Serial.println();
  Serial.println("Booted");
  Serial.println("Connecting to Wi-Fi");

  WiFi.mode(WIFI_STA);
  WiFi.begin (ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    Serial.print(".");
    delay(500);
  }
  Serial.println("WiFi connected");
}

void loop() {

  // first parameter: Time zone in floating point (for India); second parameter: 1 for European summer time; 2 for US daylight saving time; 0 for no DST adjustment;
  dateTime = NTPch.getNTPtime(1.0, 1);

  if(dateTime.valid){
    NTPch.printDateTime(dateTime);

    byte actualHour = dateTime.hour;
    byte actualMinute = dateTime.minute;
    byte actualsecond = dateTime.second;
    int actualyear = dateTime.year;
    byte actualMonth = dateTime.month;
    byte actualday =dateTime.day;
    byte actualdayofWeek = dateTime.dayofWeek;
  }
}

So how do i tell the Email-Session that the hour is in byte actualHour for example?

Sorry, i am a beginner still ;-(

[mobizt]

The settings from these 3 lines,

session.time.ntp_server = "pool.ntp.org,time.nist.gov";
session.time.gmt_offset = xx;
session.time.day_light_offset = xx;

are for system time setting via the function configTime. You can google for "esp8266 esp32 configTime".

With the configTime function that available to use in the core library, you don't need other NTP libraries e.g. NTPtimeESP to set the time.

Third party NTP time library may be required when you want more time accuracy for multiple devices synching operation.

Why your device system time need to set when using this library?

It is because RFC standard required the Date header to be set in the message envelope before sending the email.

Then we use the system time to construct the valid Date header in mail sending only.

If you don't set your device system time by any means, library will set it for you with GMT+0 and no day light saving offset.

Alternatively, if you have the time read from RTC chip, you can set the system time with function settimeofday. You can google for "settimeofday" as found in Unix system too.

If you have this such basic question, please spend the time to play with basic examples which are available in Arduino IDE or search google for how to set up esp8266 esp32 time or learning the basic things from community forum.