Signal-desktop: Respect macOS system date/time formats

[glward]

• [X] I have searched open and closed issues for duplicates
  

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Bug description

When using macOS, changes from the default system date/time formats are not respected in Signal Desktop

Steps to reproduce

1. Change the format for dates or times in macOS (System Preferences>Language & Region). In my case, I have "24-Hour Time" checked, and the dates customized so that the "full date" format is (for example) "Thursday, 01 April 1976".
2. Look at the timestamps in Signal desktop

Actual result:

Signal displays times with a 12 hour clock and default date format

Expected result:

Signal displays times with a 24 hour clock and uses the OS date formats where a full timestamp is shown.

Screenshots

Platform info

Signal version: v1.15.0

Operating System: macOS 10.13.4

Linked device version: iOS 2.28.0.15

[badanka]

Could we perhaps expand this feature request to also include Signal Desktop respecting Windows OS time and date settings? I'd love to get at least the 24-hour clock timestamps in Win10, just as glward wants to have on macOS.

[richlv]

Would it be correct to assume that there is no option to switch to 24 hour clock in Signal preferences?