Every 12 hours
0 */12 * * *
On the hour, every 12 hours. Twice a day, at midnight and noon.
Check the next five runs
Output
The result shows up here. Your input is not written to the log.
Questions
›What does 0 */12 * * * mean?
On the hour, every 12 hours
›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.