Five-field crontab, explained in this tab
This builder speaks classic Vixie/crontab syntax: minute, hour, day of month, month, day of week. It does not accept a sixth seconds field, Quartz, or systemd OnCalendar=. If your scheduler wants those, this page will not silently translate them.
The next-run list is computed in the browser from the expression and your current timezone. It is a preview, not a job runner. Nothing is stored and no webhook is registered.
Day-of-week 0 and 7 are both Sunday. Lists, ranges, and steps (1,15, 1-5, */5) work; named months and days are accepted where crontab does. If the parser cannot read a field, the preview stays empty instead of inventing a schedule.