What cron dialects does this tool support?

It supports standard 5-part (Linux/Vixie), 6-part (with leading seconds), and Quartz (Java/Spring) cron formats.

How does the tool handle daylight saving time (DST)?

It calculates future execution times using IANA timezone rules, automatically adjusting for DST transitions in your specified timezone.

Why do day-of-month and day-of-week fields behave differently when both are restricted?

In standard cron, if both day-of-month and day-of-week are restricted, they are evaluated as an OR condition, meaning the job runs if either condition is met.

Can I view execution times in a timezone other than UTC?

Yes, you can input any valid IANA timezone name, such as America/New_York or Asia/Shanghai, to see local execution times.

Is my cron expression processed securely?

Yes, the parsing, field breakdown, and execution calculations run fully locally in your browser, while only the optional AI explanation is generated externally.

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Cron Expression Explainer

Parse a 5-part / 6-part / Quartz cron expression into a plain-language schedule description, show the field-by-field breakdown, and list the next N execution times in any IANA timezone — with an AI-generated natural-language explanation in your language

Details

What this tool helps you do

Paste a cron expression and the tool will:

Parse it for the dialect you choose — standard 5-part (Linux/Vixie), 6-part (with leading seconds), or Quartz (Java/Spring, with optional trailing year). Supports *, ranges (1-5), lists (1,3,5), steps (*/15), named months/days (JAN, MON), and ?.
Describe the schedule deterministically in plain English — including the classic gotcha that day-of-month and day-of-week are OR'd when both are restricted.
Explain it again, naturally, via an AI model in your chosen language.
List the next N execution times in any IANA timezone, each with local time, UTC equivalent, and "from now" delta, with proper DST handling.

Everything except the optional AI explanation runs fully locally and deterministically.

Execution

Run this tool

Fill in the form, run the tool, and review the result in one place.

Prepared example runs

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1 examples

Explain "0 9 * * MON-FRI"

A standard cron that runs at 09:00 on weekdays — see the deterministic description, AI explanation, and next 10 runs in your timezone.

<div>Parses to "at 09:00 on Mon–Fri", lists the next 10 weekday 09:00 runs, plus an AI explanation.</div>

Inputs

Set the required fields, then run the tool.

5 options

ContentPaste or type the main input values.2

Cron ExpressiontextRequiredTimezone (IANA)textOptional

SettingsAdjust formats, ranges, numbers, and modes.3

DialectselectOptionalNext occurrencesnumberOptionalExplanation languageselectOptional

Result

Ready for a run

Run the tool to preview files, text, structured data, or streamed output here.

Samples

Cron Expression Explainer

What this tool helps you do

Run this tool

Prepared example runs

Inputs

Result

Examples that match this tool

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Inputs

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Learn when to use this tool, what it supports, and how real users apply it.

Key facts

Overview

When to use

How it works

Use cases

Examples

1. Verifying a Weekday Business Hours Cron

2. Parsing Quartz Scheduler Expressions

FAQ

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