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Cron Next-Run Time Calculator

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入力

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クライアント側

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ガイド

Cron Next-Run Time Calculator

Enter a cron expression and instantly see when it will fire next. This tool parses standard 5-field cron expressions, calculates the next scheduled run times, generates a human-readable description, and shows a countdown to the next execution — all in your local timezone and UTC.

使い方

Type or paste a cron expression (e.g., 0 9 * * 1 for every Monday at 9 AM), select how many upcoming runs to display (5, 10, or 20), and click 計算. The tool shows a human-readable description, countdown to the next run, and a complete schedule of upcoming executions.

特徴

Next N Runs – Calculate the next 5, 10, or 20 scheduled execution times
Human-Readable Description – Translates cron expressions into plain English: “Every Monday at 9:00 AM”
Countdown Timer – Shows “fires in 3 hours 24 minutes” for the next scheduled run
Dual Timezone Display – Shows times in both your local timezone and UTC
Full Cron Syntax – Supports wildcards (*), ranges (1-5), lists (1,3,5), steps (*/5), and named values (MON-FRI, JAN-DEC)
Preset Examples – Quick-load common cron schedules for testing
クライアントサイドのみ – All calculations happen in your browser

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 よくある質問

What is the cron expression format?

A standard cron expression has five fields separated by spaces: minute (0-59), hour (0-23), day of month (1-31), month (1-12 or JAN-DEC), and day of week (0-7 or SUN-SAT, where both 0 and 7 represent Sunday). Each field can contain a specific value, a wildcard (*) for any value, a range (1-5), a list (1,3,5), or a step value (*/5 for every 5 units).
How does the calculator handle timezones?

The calculator uses your browser's local timezone by default and also displays UTC times alongside. Cron expressions themselves are timezone-agnostic — the same expression fires at different absolute times depending on the server's timezone setting. This tool shows both perspectives so you can verify your schedule works correctly regardless of where your server is located.
What does */5 mean in a cron expression?

The */5 syntax means every 5th unit of that field. In the minute field, */5 means every 5 minutes (0, 5, 10, 15...). In the hour field, */5 means every 5 hours (0, 5, 10, 15, 20). You can also use step values with ranges: 1-30/5 means every 5th minute from minute 1 through 30 (1, 6, 11, 16, 21, 26). Steps work on any field and are one of the most useful cron features for regular intervals.