I have a trigger that I need to have run every 12 hours. At 1am and 1 PM.
I have researched this online and found that this expression should do it:
0 1,13 * * *
This is explained as:
0 1,13 * * *
- - - - -
| | | | |
| | | | +----- all days of the week (Monday through Sunday)
| | | +------- all months
| | +--------- all days of the month
| +----------- hour 1 and 13 (1 am and 1 pm) of the day
+------------- min 0 of the hour