Cron Job timing

Question

Lets say

0   0,12    *   *   * command

is what you write a cron job, which runs twice a day on 00hour and 12th hour.

How to write to do cron job twice a day but lets say on 2pm and 2am?

Answer 1

cron runs on a 24 hour clock starting from 0 as midnight and 23 as 11 pm. As such you'd simply have to replace 0,12 with 2,14

Answer 2

try this cron job calculator http://www.csgnetwork.com/crongen.html