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How does PM and AM work with crontab in raspberry pi? – Debian

I want to reboot my raspberry pi every day at 4 in the morning because it’s the perfect time to reboot because its guaranteed no one will connect to it, As I am hosting a local server on there and just to ensure that it doesn’t slow down or anything I want to reboot it.

I heard you can use crontab?

Would it look like this?
0 0, 4 * * * reboot ?
Or is this 4 at night?

I don’t understand how PM or AM works in this format or system.

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2

Answers


  1. 0

    Cron uses the 24 hour clock. PM is hours between 12 and 23.

    4am every day would be:

    0 4 * * * reboot

    (without the extra 0, you’ve inserted in yours).

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  2. 0

    This line will reboot it @4 am in the morning

    0 4 * * * reboot

    I prefer using https://crontab.guru/#00_00__ this will help you time your cron events.
    This is an excellent page to verify your cron time.

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