Every Sunday at midnight
0 0 * * 0
At 00:00, only on Sunday. Sunday 00:00. Some cron daemons treat 0 and 7 as Sunday.
Check the next five runs
Output
The result shows up here. Your input is not written to the log.
Questions
›What does 0 0 * * 0 mean?
At 00:00, only on Sunday
›Which timezone are the next runs in?
The expression is evaluated in UTC. This page also shows those times in the timezone of the browser you are using.