On https://slack.com/, how do I display message timestamps in 24-hour format instead of AM/PM?

  • 2
    See the support page for slack that shows exactly how. – user144900 Feb 28 '17 at 4:09
  • @GypsySpellweaver bam there's the answer. don't know how I missed it, thanks! – Jeff Puckett Feb 28 '17 at 4:32
  • Hated to actually copy paste that into an answer :-> – user144900 Feb 28 '17 at 4:48
  • @Gypsy: You should anyway. This allows for the Asker to mark it as accepted, which acts as a signpost to future readers looking for the same solution. I've added a Community Wiki answer, but if you'd like to add your own please feel free to do so and I'll delete mine. – ale Feb 28 '17 at 13:53

From Slack support:

  1. Click your team name to open the Team Menu.
  2. Choose Preferences.
  3. Select the Messages & Media tab.
  4. Check out the Message Theme and Display Options settings.

You can adjust other message-related settings under Display Options:


  • Show times with 24-hour clock
    Choose between 24-hour and 12-hour times (e.g. 16:12 or 4:12 PM).
  • It works. However slackbot still uses 12-hour clock. – galcyurio Sep 5 '19 at 2:25
  • setting this option only half works. I still see "Call Ended Ended at 3:56 PM - Lasted 10 minutes" – Marc Sep 24 '20 at 14:06

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