⏰

Cron Expression Parser

Parse cron expressions into plain English and preview next execution times. Powered by cronstrue.

Cron Expression
·
·
·
·
Description
Next 10 Runs
Common Examples

About Cron Expression Tester

This tool parses any standard 5-field cron expression and converts it into a plain-English description, then computes the next 10 actual execution times based on your local clock. You can enter fields individually (minute, hour, day, month, weekday) or type the raw expression directly and hit Parse.

Everything runs in your browser — no server is involved, so no data is transmitted. Bookmark this page to quickly validate cron schedules before deploying to production servers, CI pipelines, or cloud schedulers.

Common Use Cases

How to Use

  1. Type a raw cron expression like 0 9 * * 1-5 into the raw input and click Parse, or edit each field individually
  2. Read the plain-English description and field breakdown in the Description panel
  3. Check the "Next 10 Runs" panel to see the upcoming execution timestamps relative to now
  4. Click any example from the Common Examples grid at the bottom to quickly load it

Frequently Asked Questions

What does the 5-field cron format mean?

Standard cron uses five space-separated fields: minute (0–59), hour (0–23), day of month (1–31), month (1–12), and day of week (0–6, Sunday=0). Each field accepts a specific value, a wildcard (*), a range (1-5), a step (*/15), or a comma-separated list (1,3,5).

Why does the "next runs" time look different from my server's timezone?

The next-run calculator uses your browser's local timezone. Most cron daemons run in the server's system timezone (often UTC). If your server is in UTC and your browser is in UTC-5, the displayed times will be 5 hours ahead of when the job actually fires on the server.

Does this support 6-field cron with seconds?

This tool follows the standard 5-field POSIX cron syntax. Some systems (like Spring's @Scheduled or Quartz) prepend a seconds field making it 6 fields. If you paste a 6-field expression, the parser will report an error — remove the leading seconds field first to use those expressions here.

Advertisement