Cron builder
Read a cron expression, or build one from a sentence.
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Which cron formats does it understand?
Standard 5-field crontab (Vixie/cronie) and 6-field Quartz (leading seconds, plus ?, L, W, and # specials). It auto-detects by field count and syntax; you can force either. Shortcuts like @daily and @reboot work too.
What is the warning about day-of-month and day-of-week?
When both are set in a standard cron, it runs on EITHER match, not only when they coincide. "0 0 1 * 2" fires on the 1st of every month AND every Tuesday. Getting "only a 1st that is a Tuesday" needs a shell guard, not one cron line.
Are the next run times in my timezone?
Yes, your browser's local time (with UTC shown alongside). Cron itself has no timezone, it runs in whatever the machine is set to.