PatternCron
The 15th of every month
Mid-month billing runs and reconciliation jobs: fires at 09:00 on the 15th every month, with no weekday restriction involved.
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In plain English
- Fires at 09:00 on the 15th of every month
- 12 runs per year
Why it’s written this way
Day-of-month is pinned to 15, month and day-of-week are left open, and the time fields put it at 09:00. Every month has a 15th, so unlike end-of-month schedules this one never needs a fallback date.
Leaving day-of-week as * matters here: if it were also restricted, say to weekdays, cron would fire on the 15th OR any weekday — almost certainly not the intended billing-day-only schedule.
Edge cases to know
- →The 15th lands on a different weekday every month; a job that assumes 'a business day' (wire transfers, say) needs its own weekend or holiday check — cron never shifts the date for you.
- →If billing depends on totals from earlier in the month, make sure whatever feeds this job has actually finished by 09:00 on the 15th — cron fires on schedule whether or not the data is ready.
- →Testing this in staging usually means faking the system clock rather than waiting a month; confirm the downstream job tolerates a mocked date before relying on the test.