Runs locally

Cron Expression Parser & Generator

Parse five-field cron schedules, preview upcoming UTC run times, and generate common expressions in the browser.

Browser-local

Cron input

Five-field cron expression and generator

Generate common schedule
UTC-based preview5-field cron

Schedule output

Cron explanation and upcoming runs

0 at 9; days every unit; months every unit; weekdays Monday through Friday

minute
00
hour
99
dayOfMonth
*every unit
month
*every unit
dayOfWeek
1-5Monday through Friday
  1. 2026-09-09T09:00:00.000Z
  2. 2026-09-10T09:00:00.000Z
  3. 2026-09-11T09:00:00.000Z
  4. 2026-09-14T09:00:00.000Z
  5. 2026-09-15T09:00:00.000Z
Expression parsed locally

How to parse cron expressions

Enter a standard five-field cron expression such as */15 9-17 * * 1-5. PayloadHarbor validates each field, explains ranges and steps, and lists upcoming matching UTC run times.

Cron generator use cases

Create common schedules for jobs, queues, scripts, reminders, and deployment tasks without guessing minute/hour positions or weekday ranges.

Limits

This browser-local parser is built for standard five-field cron. It does not evaluate provider-specific seconds fields, aliases, time zones, calendars, or infrastructure-specific extensions.

Cron questions

Which cron format is supported?
This MVP supports standard five-field cron expressions: minute, hour, day of month, month, and day of week.
Does it use my server timezone?
No. The preview is browser-local and displays upcoming UTC timestamps for deterministic inspection.
Can it generate cron expressions?
Yes. It can generate common daily, weekday, hourly, and every-N-minutes schedules.

What this Cron Parser does

Use this cron expression parser and generator to explain standard five-field cron schedules and preview upcoming UTC run times. It helps developers, QA engineers, and data engineers verify job timing before copying a schedule into infrastructure, scripts, queues, or documentation.

When developers use it

  • Parse cron expressions from CI, schedulers, queues, and deployment jobs before changing them.
  • Generate common daily, weekday, hourly, or every-N-minutes cron schedules without memorizing field order.
  • Copy a structured schedule report for runbooks, tests, and release notes.

Privacy, input, and output

Cron parsing and schedule generation run locally in your browser. PayloadHarbor does not upload expressions or create scheduled tasks.

Enter a five-field cron expression or generate one from common presets. The output explains each field and lists the next matching UTC times as a JSON report.

Validation rules and limitations

  • The parser supports standard five-field cron only; provider-specific seconds fields, @aliases, timezone syntax, and special characters such as L or W are not evaluated.
  • Upcoming run previews use UTC timestamps for deterministic inspection and may differ from a provider configured with a different timezone.