Question 1

Which cron syntax does it support?

Accepted Answer

Standard 5-field Unix cron: minute, hour, day-of-month, month, day-of-week. Step values, ranges and lists (e.g. 0-30/5) are supported.

Question 2

Are special strings supported?

Accepted Answer

Yes. @yearly, @monthly, @weekly, @daily, @hourly are recognised in the input.

Question 3

How accurate are the next-run times?

Accepted Answer

Times are computed in your local timezone using your machine clock. Daylight saving transitions follow standard cron behaviour.

Question 4

Is anything sent to a server?

Accepted Answer

No. The Cron Builder runs 100% in your browser. Your expressions are never uploaded.

Cron Expression Builder & Parser