1158733 - Detect system timezone from Javascript Internationalization API

Status: RESOLVED FIXED

(Calendar :: Internal Components, defect, P2)

Description

[Philipp Kewisch [:Fallen] [:📆][:🧩]]

With the Intl API its possible to get the system timezone in one line of code. This would mean we can get rid of the whole guessSystemTimezone. Here is how:

Intl.DateTimeFormat().resolvedOptions().timeZone

Requires bug 895737 and maybe bug 837961 fixed.

Comment 1

[Zibi Braniecki [:zbraniecki][:gandalf]]

What is guessSystemTimezone? I can't find in the source.

Is there a chance that this is already fixed?

Comment 2

[Martin Schröder [:mschroeder]]

Zibi, here is the function "guessSystemTimezone" in Lightning: https://dxr.mozilla.org/comm-central/source/calendar/base/src/calTimezoneService.js#299

Comment 3

[Philipp Kewisch [:Fallen] [:📆][:🧩]]

Yes, it does seem Intl.DateTimeFormat().resolvedOptions().timeZone gives the most current timezone, this bug could probably be fixed in Lightning now.

Of course having a way to detect if the timezone changes would be favorable, I'm not sure if that is possible yet.

Comment 4

[Sisim Biva]

I'm using TB 52.5 under Windows 10 and the timezone is still not automatically changed using the system timezone. Do you plan to implement it shortly?
Thanks!

Comment 5

[[:MakeMyDay]]

This is still blocked by bug 895737 (effectively by bug 1343826; I just checked, a runtime change of the system timezone is still not detected). That said, once that is fixed, we're happy to consider this bug for the then upcoming esr version.

Comment 6

[Ashutosh Bharambe]

Hi, Can I work on this? I am new.

Comment 8

[Martin Schröder [:mschroeder]]

Attachment: Bug 1158733 - Detect system default timezone from JavaScript Internationalization API. r=darktrojan

Comment 9

[Martin Schröder [:mschroeder]]

Removing the dependency on bug 1343826 to move the topic "system timezone change" to bug 1606357.

Comment 10

[Magnus Melin [:mkmelin]]

Very nice indeed, thx Martin!

Comment 11

[Pulsebot]

Pushed by [e-mail]:
https://hg.mozilla.org/comm-central/rev/4315d972034a
Detect system default timezone from JavaScript Internationalization API. r=darktrojan

Comment 13

[Matt]

As Bug 1684021 appears to have messed up the Brazilian timezones DST again, would uplift of this to ESR be a suitable fix?

Comment 14

[Martin Schröder [:mschroeder]]

(In reply to Matt from comment #13)

As Bug 1684021 appears to have messed up the Brazilian timezones DST again, would uplift of this to ESR be a suitable fix?

This is only relevant for determining the system timezone at first start or when no timezone has been set in Thunderbird preferences for calendar. So, this is not a fix for the problem you described.