Daily Cron Job Example

Question

I want to run a command daily on an Ubuntu Linux box @ 9:15PM. Is this the correct entry for my crontab?

15 23 * * * <<command>>

Answer 1

The syntax is, the hours not

minute hour dayofmonth month dayofweek     command

Your command will run every day at 23:15 (11:15pm)

9pm is 21 (in 24h writing 12 + 9 = 21)

15 21 * * *  command