Respect regional settings for date/time (beyond the default locale settings)

[wiesmann]

Bug Description

Signal on Mac OS X does not respect the operating system settings for date/time formatting.

Steps to Reproduce

1 Go to System Preferences
2 Select Language & Region
3 Select Switzerland
3 Select Time Format: 24 hours time format
4 Launch Signal
5 Look at messages that are in the past.

Actual Result:

Signal displays times in US format, i.e. Tue 5.56 pm.

Expected Result:

Signal displays times in the chat conversation 24 hours format, i.e. Tue 17:56 like for instance the iOS version.

Screenshots

System Settings:

Conversation Mac OS X:

Conversation iOS:

Platform Info

Signal Version: v5.12.2
Operating System: Mac OS X 11.5.1 (20G80)
Linked Device Version: iOS 14.7.1

Link to Debug Log

There are no logs, as the bug only appears for messages in the past.

Note that bug #5248 describes a similar issue for Windows.

[sockbot]

If this is a good starter bug, I'd like to take this one on.

[literal-0x4e]

I am experiencing this same bug on linux, so it does not seem to be limited to OS X.

Wonder, how it is on windows? EDIT: I was told windows is not affected.