[SR-16114] Date formatting ignoring iOS user's 24 hour setting

[swift-ci]

Previous ID	SR-16114
Radar	None
Original Reporter	cjmash (JIRA User)
Type	Bug

Environment

iOS 15.4, iPhone 13 Pro and iPhone 7

Additional Detail from JIRA

Votes	0
Component/s	swift
Labels	Bug
Assignee	None
Priority	Medium

md5: d994803846ed6523cc5965f0000f5224

Issue Description:

Using the following code to format a date to a string doesn't honour the iOS device setting for "24-Hour Time" (under Date & Time settings), it seems to just take whatever the default is for the region, so it changes between 24 hour and 12 hour times for UK and US, but if the user changes from the default "24-Hour Time" setting it sticks with the regions default.

return date.formatted(.dateTime
                       .weekday()
                       .day()
                       .month(.twoDigits)
                       .year()
                       .hour()
                       .minute())

The following behaves correctly:

let formatter = DateFormatter()
formatter.setLocalizedDateFormatFromTemplate("E, dd/MM/yy, j:mm")
return formatter.string(from: date)

I came across this after an Australian user reported that my app was ignoring her 24-Hour Time setting (enabled) and showing AM/PM times instead.

[AnthonyLatsis]

cc @parkera

[parkera]

We should reopen this in the swift-corelibs-foundation bug tracker.

[parkera]

Or, filing a bug report would be appropriate. Follow up with the feedback number and I'll make sure it get to the right place. I suspect this is behaving correctly, so a test case would be helpful too in case that helps us understand what the issue is.

[AnthonyLatsis]

@parkera You can transfer the issue, no need to close and reopen. The author didn’t specify a GitHub username during the migration to GitHub Issues, so contacting them is probably not a option.