The ETL_JOB_TRIGGER_TIME variable specifies the time and date for recurrent Extract, Transform and Load (ETL)jobs.
Cron expression.
0 30 2 * * ?
This variable takes a cron expression for a value, and not an absolute time value. The default value evaluates to 2.30 a.m. local time. For help with cron expressions, see Cron Trigger Tutorial.