Cron Expression Parser

Parse a cron expression and preview its next scheduled run times, using your browser's local timezone.

About cron syntax

Standard 5-field cron: minute hour day-of-month month day-of-week. Each field accepts a value, a range (1-5), a step (*/15), or a comma-separated list (1,15,30). A leading seconds field (6 fields total) is also supported. Parsing uses the cron-parserlibrary rather than a hand-rolled parser, since edge cases like month-end day-of-week handling are easy to get subtly wrong.

Share on LinkedInShare on X
Link to this tool

Copy this HTML to cite this tool from your own site or article.

About Cron Expression Parser

Cron Expression Parser interprets standard 5-field crontab schedules into human-readable descriptions and previews upcoming execution times.

How to use Cron Expression Parser

  1. Enter a 5-field cron expression (e.g. */15 * * * *).
  2. Click Parse Cron to evaluate schedule rules.
  3. Read natural language schedule explanation (e.g. "Every 15 minutes").
  4. Inspect the list of upcoming 5 scheduled run timestamps.

Examples

Cron Expression: 0 9 * * 1-5 Explanation: At 09:00 AM, Monday through Friday Next Run: Next scheduled weekday at 09:00 AM

FAQ

Does this parser support step values like */5?

Yes. Step values (*/5), ranges (1-5), and comma lists (1,15,30) are parsed accurately.

Which timezone is used for previewing next run times?

Next run times are calculated using your local browser timezone or UTC based on your selection.

You might also want ...

DevOps

Cron Expression Generator

Build and validate a standard five-field cron expression from individual schedule fields.

DevOps

.gitignore Generator

Combine common .gitignore snippets for languages and editors into one file.

DevOps

chmod Calculator

Convert Unix file permissions between checkboxes, octal, and symbolic notation.