Cron: First of the month (0 0 1 * *)

The cron expression 0 0 1 * * translates to “At 00:00, on the 1st”. It is one of the most commonly used schedules (first of the month).

This uses the day-of-month field: `1` pins the job to the first day of the month, and with minute 0 and hour 0 it runs at 00:00 on the 1st of every month. It is the standard "monthly job" - generating invoices or statements, rolling monthly reports, resetting monthly quotas or usage counters, archiving the prior month. Because the day-of-month is fixed and the weekday stays `*`, the run lands on the 1st whatever weekday that is. (A subtle cron rule: if you ever set both day-of-month and day-of-week to non-wildcards, cron treats them as OR, not AND - not a concern here since weekday is `*`.)

Use the builder above to tweak this expression and instantly see how the description and the next run times change.