sysop@hub:~/tools/cron-builder$

cron-builder

Five fields that everybody looks up every time. Type a cron expression or pick a schedule: you get what it means in plain words, when it runs next, the traps in it, and the same schedule as a systemd timer and as a Windows scheduled task.

Schedule (minute, hour, day of month, month, day of week) Command to run Name of the job

the five fields

Field	Values	Examples
Minute	0 to 59	`0` on the hour, `*/15` every quarter, `5,35` twice an hour
Hour	0 to 23	`2` at night, `8-17` office hours, `*/6` four times a day
Day of month	1 to 31	`1` the first, `1,15` twice a month
Month	1 to 12, or jan to dec	`*` every month, `1,4,7,10` each quarter
Day of week	0 to 7 (0 and 7 are Sunday), or sun to sat	`1-5` Monday to Friday, `0` Sunday

Reads the classic five-field cron of Linux and macOS, with lists, ranges, steps, names and the @daily style shortcuts. The six- and seven-field forms of Quartz, Spring and cloud schedulers are different dialects. The next runs are worked out in your browser's time zone. Related: systemd and journalctl cheat sheet, Bash scripting cheat sheet, command builder, database backup cheat sheet.