Crontab schedule monthly

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http://serverfault.com – I would like to schedule my tasks every x months on day 1 starting for example, March. I am unsure if this is the syntax I'm looking for (for repeating the job every 4 months): 0 0 1 3/4 * /path/to/file The man page for crontab does not explain in detail how the steps (/) work. (HowTos)