Openbox Ubuntu 12 hour time

[mahesh]

Hi,

I have a question that I am hoping that someone may be able to help me with. I am running Ubuntu 20.04 with Openbox. I am in the USA and the locale seems to be set to en_US on this machine. However, when I execute a ls-la command, or attach a file in Thunderbird, or open a file in LibreOffice, all of the timestamps are in 24-hour time.

Is there anything that I can do to make these appear in 12-hour time (am/pm)?

Thank you for any help that you can provide.