Change the date and time format
By default, messages in Zulip are displayed with a 12-hour timestamp (e.g. 3:00 PM, not 15:00). If you prefer to see the time displayed in a 24-hour format, you can do so easily using the following procedure:
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Go to the Display settings tab of the Settings page.
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Select the option labeled 24-hour time (17:00 instead of 5:00 PM).