Currently the 'Start of the Week' cannot be changed in the Change calendar per user unless we change the user profile language. This can be changed globally as mentioned here. Customer would like to let the users change the Start of the week without changing the user profile language.
Eg Scenario : Customer would like to use the Denmark Calendar in the Change calendar where the Start of the week is Monday. Currently, the user profile language needs to be changed to Denmark language for Jira to show up Start of the week as Monday.
Also add 12 to 24 hour clock.
In general it could be nice that no time/calendar configuration depended on language.