[BUG] - GMT+/- issue

[donald-sick]

2 issues:

1. The GMT+/- is not working properly.
2. Using GMT+/- is not applicable for those has day light saving.

CSK module:

• Version: 3.0.0

AppSpace device used:

• SIM2500

To Reproduce
Steps to reproduce the behavior:

1. On Australia Melbourne time zone
2. Select GMT+10, it is only 1 hour later than GMT
3. Select GMT+1 is 10 hour different from GMT

Expected behavior
Select Australia/Melbourne in the list instead of GMT+10. Time Zone will change between GMT+10 and GMT+11 for day light saving.

Additional context
DateTime.setTimeZone() supports IANA tz database format. The string 'GMT+1' is not IANA tz database format. So the design is wrong.

[golluroSICKAG]

Thank you for your bug report! So far we just created these timezones as in the past there was an issue, that not all possible timezones (like 'Australia/Melbourne') were accepted by all devices, so we just limited the scope to these "Etc/GMT" zones. But I will check this issue again and will try to find out if this can be improved / fixed.

[golluroSICKAG]

Hi!

I pushed a new version of the DateTime module, see this PR In this version it is possible to set a custom timezone via UI. The UI will respond if it was successful or not. So it should be possible to use e.g. "Australia/Melbourne" as timezone now.

Beside of this, 2 more things:

• Related to this page it seems that the "Etc/GMT..." timezones are canonical (primary, preferred zone name). Do you agree with this?
• Is it possible that your described behaviour is related to the fact, that these "Etc/GMT..." timezones are "intentionally inverted", as described in this link: "The special area of "Etc" is used for some administrative zones, particularly for "Etc/UTC" which represents Coordinated Universal Time. In order to conform with the POSIX style, those zone names beginning with "Etc/GMT" have their sign reversed from the standard ISO 8601 convention. In the "Etc" area, zones west of GMT have a positive sign and those east have a negative sign in their name (e.g "Etc/GMT-14" is 14 hours ahead of GMT)."

[donald-sick]

Tested the new version.

1. Run the CSK_Module_DateTime in the AppStudio simulator. It is the only app running.
2. Open the page, both the 'Select timezone' dropdown and 'Custom timezone' input box are showing 'Australia/Sydney'
3. Change input box to 'Australia/Melbourne' then click Set Time button
4. The dropdown and input box are set back to 'Australia/Sydney'

Expected behaviour: The input box won't change and dropdown is set to 'Australia/Melbourne'

[golluroSICKAG]

Please check following steps:

• Please try to change the timezone BEFORE anything else, especially before it is connected to a NTP server. So maybe deactivate NTP if it was active, reboot the device and then try to change the timezone.
• There should be an UI feedback if it worked to set the timezone or if it did not work.
• Do you run the CSK logger module and did you check the log feedback?
• Does it work to set another timezone?

[donald-sick]

Tested on SIM2500, everything works as expected. My previous test was on emulator which doesn't have permission to change Windows timezone I guess.

[golluroSICKAG]

That sounds great! After an internal review this update will be merged. Kind regards!