Does it support all cron dialects?

Standard 5-field Unix cron, plus 6-field with seconds (Quartz, Spring), and special strings (@hourly, @daily). The dialect is auto-detected from the input.

What's the max future runs it shows?

Next 10 runs by default. Toggle up to 100 to spot seasonal patterns or check year-boundary behavior (February 29, daylight savings).

What about timezones?

The parser assumes UTC by default. Toggle to your local timezone to check when a job will actually fire from your perspective. DST shifts are handled.

Does it validate the expression?

Yes — out-of-range values (`60 * * * *`, `* * 32 * *`) get clear error messages. Much better than the 'it silently never fires' mode of real cron.

Cron Expression Parser | DevTools Surf

DevTools Surf

Example: Cron Expression Parser

A worked example, rendered from real sample data. Sign in to run the tool on your own input.

Input

*/15 * * * *

Output

=== Cron Expression: */15 * * * * ===

Fields:
  Minute: Every 15 minute(s) (range: 0-59)
  Hour: Every hour (range: 0-23)
  Day of Month: Every day of month (range: 1-31)
  Month: Every month (range: 1-12)
  Day of Week: Every day of week (range: 0-6 (Sun=0))

Next 5 runs:
  1. 2026-09-20 12:15
  2. 2026-09-20 12:30
  3. 2026-09-20 12:45
  4. 2026-09-20 13:00
  5. 2026-09-20 13:15

About Cron Expression Parser

Cron Expression Parser preview - Generators tool

Describe cron expressions in plain English with next run times. Part of the DevTools Surf developer suite. Browse more tools in the Generators collection.

Use Cases

Verify CI/CD pipeline schedules before deploying
Debug crontab entries that aren't firing when expected
Convert human-readable schedules into cron syntax for GitHub Actions or Kubernetes CronJobs
Preview next run times across daylight saving boundaries

Tips

Click any preset to fill common patterns like daily, hourly, or weekly
Edit individual fields (minute, hour, day, month, weekday) separately for precise control
See the next 10 scheduled runs in your local timezone to verify the expression does what you expect

Fun Facts

Cron was written by Ken Thompson for Unix in the 1970s. The name comes from Chronos, the Greek personification of time.
The modern vixie-cron (written by Paul Vixie in 1987) is still the default cron daemon on most Linux distributions today.
Cron has no built-in concept of timezone — jobs run in the system's local time, which has caused countless bugs during daylight saving transitions.

FAQ

Does it support all cron dialects?: Standard 5-field Unix cron, plus 6-field with seconds (Quartz, Spring), and special strings (@hourly, @daily). The dialect is auto-detected from the input.
What's the max future runs it shows?: Next 10 runs by default. Toggle up to 100 to spot seasonal patterns or check year-boundary behavior (February 29, daylight savings).
What about timezones?: The parser assumes UTC by default. Toggle to your local timezone to check when a job will actually fire from your perspective. DST shifts are handled.
Does it validate the expression?: Yes — out-of-range values (`60 * * * *`, `* * 32 * *`) get clear error messages. Much better than the 'it silently never fires' mode of real cron.

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