Developer Tools
Cron Expression Parser
Parse a standard five-field cron expression and explain the minute, hour, day, month, and weekday fields in plain language.
Plain-language schedule summary
Expression: */15 9-17 * * mon-fri Runs at minute every 15 values of hour 9-17, when day-of-month is every value and day-of-week is 1-5, every month. Fields: - Minute: */15 → every 15 values (allowed 0-59) - Hour: 9-17 → 9-17 (allowed 0-23) - Day of month: * → every value (allowed 1-31) - Month: * → every value (allowed 1-12) - Day of week: mon-fri → 1-5 (allowed 0-7) Note: This parser explains standard five-field cron syntax. It does not execute jobs or account for a server timezone, scheduler-specific seconds fields, or Quartz-only modifiers.
Field breakdown
Minute
*/15 means every 15 values. Allowed range: 0-59.
Hour
9-17 means 9-17. Allowed range: 0-23.
Day of month
* means every value. Allowed range: 1-31.
Month
* means every value. Allowed range: 1-12.
Day of week
mon-fri means 1-5. Allowed range: 0-7.
Cron Expression Parser workflow tips
Use this cron parser when you need to understand a crontab schedule before editing a job, documenting a runbook, or checking whether a recurring task is too frequent.
Explain schedules before changing them
Paste the expression from a crontab, CI job, monitoring rule, or scheduler config and read the field-by-field meaning before making edits.
Pair with developer data tools
Use Unix Timestamp Converter for log times, JSON Formatter for config snippets, and Regex Escape Tool for literal patterns in automation rules.
Know the limits
This tool explains standard five-field cron syntax. It does not execute jobs, fetch server settings, infer timezone behavior, or validate scheduler-specific Quartz modifiers.
What this tool does
Breaks cron schedules into field-by-field summaries, validates common ranges, supports lists, ranges, steps, and month or weekday names, and produces a copy-ready explanation.
Common use cases
Explain standard cron schedules in plain language before editing jobs, documenting runbooks, or debugging automation timing.
Use Cron Expression Parser when you are working with copied API payloads, logs, encoded values, config snippets, identifiers, or debugging data and need a quick browser-local check before pasting the result into docs, tickets, tests, or another developer tool.
How to use it
- Paste a standard five-field cron expression such as */15 9-17 * * mon-fri.
- Review the plain-language schedule summary and field breakdown.
- Copy the explanation for documentation, code review, runbooks, or scheduler debugging.
Example workflow
Copy a small payload or encoded value from an API response, request URL, log line, or config file. Run the focused check here, confirm the output is readable, then continue with related developer data tools such as validation, formatting, decoding, timestamp conversion, or CSV/JSON conversion.
Privacy note
Cron parsing runs entirely in your browser. ClearUtils does not upload, store, run, or schedule the expression you paste.
FAQ
What cron format does this parser support?
It supports standard five-field cron expressions: minute, hour, day of month, month, and day of week.
Does this tool run or schedule my cron job?
No. It only explains the pasted expression in your browser. It does not execute jobs, create schedules, fetch server settings, or store input.
Can it parse weekday and month names?
Yes. Common names such as mon-fri and jan-dec are recognized for day-of-week and month fields.
Explore more tools
Browse the Developer Tools hub or continue with the Developer Data Toolkit when this task is part of a larger workflow.