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You can try with this :
hey understand the crontab pattern
+---------------- minute (0 - 59)
| +------------- hour (0 - 23)
| | +---------- day of month (1 - 31)
| | | +------- month (1 - 12)
| | | | +---- day of week (0 - 6) (Sunday=0 or 7)
| | | | |
30 2 * * *
command to be executed
Try this : 30 2 * * *