Every 30 minutes
*/30 * * * *
Every 30 minutes. Twice an hour, at minute 0 and minute 30.
Check the next five runs
Output
The result shows up here. Your input is not written to the log.
Questions
›What does */30 * * * * mean?
Every 30 minutes
›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.