Cron Every 5 Days

The cron expression 0 0 */5 * * runs at midnight on every 5th day of the month — specifically on days 1, 6, 11, 16, 21, 26, and 31. The */5 step in the day-of-month field counts from day 1 (the first of the month).

Note that this doesn't mean "exactly every 5 days." The interval resets at the start of each month: if the month has 31 days, it runs on the 31st and then again on the 1st (just one day gap). For 30-day months, it runs on the 26th then the 1st (a 5-day gap). This is a fundamental limitation of cron's date-based matching.

For truly uniform 5-day intervals regardless of month boundaries, you'd need an external scheduler that counts elapsed days. But for most practical purposes, this expression provides roughly 5-day spacing.