Paste a cron expression and see exactly what it means and the next times it will run. Nothing to install, nothing uploaded.
Try: */15 * * * *, 0 0 1 * *, 30 8 * * MON-FRI, @hourly
| # | When | In |
|---|
| Field | Allowed | Special |
|---|---|---|
| Minute | 0–59 | * any · , list · - range · */n every n · names for months (JAN–DEC) and weekdays (SUN–SAT) |
| Hour | 0–23 | |
| Day of month | 1–31 | |
| Month | 1–12 | |
| Day of week | 0–7 (0 or 7 = Sun) |
Convention handled correctly: when BOTH day-of-month and day-of-week are restricted, cron fires when EITHER matches (not both) — the same rule real cron daemons use.