Hourly at minute 15
15 * * * *
At 15 minutes past the hour. Offset from the hour so it does not collide with other top-of-hour jobs.
Check the next five runs
Output
The result shows up here. Your input is not written to the log.
Questions
›What does 15 * * * * mean?
At 15 minutes past the hour
›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.