About this cron parser
Type a 5-field cron expression (minute hour day month weekday); *, comma lists, ranges and steps (*/n) are supported, and the month and weekday fields also accept abbreviations like JAN and MON. A valid expression gets a plain-language description plus the next 5 run times in your browser's local time zone; invalid input points at the exact field and value that broke it.
Upcoming runs are computed with a day-skipping search: dates whose month / day / weekday cannot match are skipped whole, and on matching dates the pre-sorted hour:minute combinations are consumed in order, so even with a 366-day look-ahead the result is instant. Check your crontab, CI schedule or systemd timer here before deploying and spare yourself the "didn't fire" incidents. Everything is computed locally in your browser.