Cron Expression to execute cron triggers for 12 hours of a day?

Question

I need a cron-expression (0 0/60 * * * ?) to fire application every 12 hours (twice a day).

Answer 1

Use e.g. 0 0 3,15 * * ? That'll run a job at 3am and 3pm. That's twice a day, with 12 hours between. You could use 0 0 0/12 * * ? which means every 12 hours. Here's some examples.

Answer 2

Some examples that fit your criteria:

30 */12 * * *

runs at 00:30:00 and 12:30:00 each day

0 3-15/12 * * *

runs at 03:00:00 and 15:00:00 each day

23 4,16 * * *

runs at 04:23:00 and 16:23:00 each day