Need Help for NTP Configurations for ESP32

[Ritesh]

Hi,

I have used NTP configurations to set time and it works fine without any issue. But, I need total List of Timezone configurations used for all over world to set time for any specific area.

Right Now, I have used following configurations as per my requirement.

// Set timezone to UTC Time
setenv("TZ", "UTC", 1);

// Set timezone to Indian Standard Time
setenv("TZ", "UTC+05:30", 1);

// Set timezone to Eastern Standard Time
setenv("TZ", "EST5EDT,M3.2.0/2,M11.1.0", 1);

// Set timezone to China Standard Time
setenv("TZ", "CST-8CDT-9,M4.2.0/2,M9.2.0/3", 1);

So, Please provide me List of standard timezone to be used world wide to set corresponding time according to setenv API. Also, Let me know if anyone has included all those timezones into single array because our application can be used in any place across world and we want to configured timezone according to that from application.

Let me know if anyone has any confusion for above use-case.

[kolban]

This is likely what you are looking for:

https://www.iana.org/time-zones

This was referenced here:

https://www.gnu.org/software/libc/manua ... iable.html

[Ritesh]

This is likely what you are looking for:

https://www.iana.org/time-zones

This was referenced here:

https://www.gnu.org/software/libc/manua ... iable.html

Thanks for providing informations.

I will check and will let you know if need any further help for that.

[jaracil]

We just created a GitHub project to maintain posix time zone strings DB.

https://github.com/nayarsystems/posix_tz_db

[martinayotte]

The DB is missing "America/Montreal" ...

[ESP_igrr]

jaracil: this is super useful, thank you for sharing. Would you mind to amend Readme mentioning what license is the project distributed under?

[WiFive]

The DB is missing "America/Montreal" ...

Same TZ as Toronto, right? To have the most compact db you only want to list the largest city per time zone. Although there are 8 cities listed in Indiana for some reason.

[jaracil]

martinayotte: Added America/Montreal.

ESP_Igrr: Just Added LICENSE file (MIT).

[martinayotte]

Thanks, jaracil !

Same TZ as Toronto, right?

Right ! But the same is true for Ottawa/Detroit/Boston/Washington/New York/Philadelphia/Atlanta/Indianapolis/Miami ...
https://www.timeanddate.com/time/map/

[WiFive]

Right but these are not on the list either Ottawa/Boston/Washington/Philadelphia/Atlanta/Miami

To make it as compact as possible, it should be only one listing per time zone per country/region and use the largest city.