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Scheduler helper

Cron Expression Editor & Parser

Edit, parse, and visualize Cron expressions in real-time.
This tool converts complex Cron syntax into human-readable descriptions and calculates the next execution schedules.
Perfect for debugging crontab entries or scheduling backend tasks.

Guide: How to use & features

  • Type a Cron expression to update the human description and next run list instantly.
  • Inspect the minute/hour/day/month/weekday parts to confirm each field’s meaning.
  • Invalid input triggers an error message so you can fix syntax quickly.
  • The tool expects the standard 5-field crontab format.

Samples: Sample input & output

5分おきに実行

Input

*/5 * * * *

Output

説明: 5分おきに実行
次回: 00:05, 00:10, 00:15 (例)

FAQ: FAQ

  • Which cron format is supported?

    It supports the standard five-field format "minute hour day-of-month month day-of-week." For example, "0 9 * * 1-5" means 9 AM on weekdays. Six-field formats that include seconds and special strings like @daily are interpreted differently across implementations, so it is safest to start with standard five-field syntax.

  • What timezone are the next run times calculated in?

    The next run times shown are calculated in your browser’s local timezone. Production cron, however, usually runs in the server’s timezone (often UTC), so account for the offset between local and server time when reading the schedule.

  • Can I use notation like */5, 1-5, or 1,15?

    Yes. * means "every," */n means "every n" (e.g. */5 is every 5 minutes), a-b is a range (e.g. 1-5 is Mon–Fri), and a,b,c is a list (e.g. 0,30 is minute 0 and 30). You can combine them to express complex schedules, and this tool translates them into a human-readable description.

Use cases: Common use cases

  • Validate job schedules

    Translate Cron expressions to confirm the actual run timing.

  • Support configuration reviews

    Share human-readable descriptions to reduce misunderstandings in reviews.

  • Debug Cron syntax

    Inspect each field’s meaning to spot mistakes quickly.

Notes: Notes & limitations

  • Work stays in your browser

    Inputs and outputs remain local. Closing the tab or clearing cache will remove any temporary state.

  • Validate critical data

    Results are helper outputs—double-check them before sending to production systems or sharing externally.

  • Large payloads depend on your device

    Very large text or files can feel slow in some browsers. Use a desktop environment for heavy workloads.

Human-readable description

Field labels

Minute -
Hour -
Day of Month -
Month -
Day of Week -

Next execution schedules

Cron Expression Parser and Editor

A must-have tool for system administrators and backend engineers to parse, visualize, and edit “Cron expressions” as human-readable schedules.
It translates cryptic strings of asterisks and numbers like 0 0 * * * or */5 * * * 1-5 into natural language descriptions like “Every day at midnight” or “Every 5 minutes, Monday through Friday”.

Primary Use Cases

  • Configuring Batch Jobs: Before scheduling a cron job directly on your production server (crontab), use this tool to verify the syntax and prevent misconfigurations that could cause unexpected server load.
  • Preview Upcoming Executions: The parser lists the exact dates and times of the next planned executions based on your formula, letting you see at a glance whether the job behaves as intended. All computations are securely processed on your local machine.

Articles for this tool

Introduction
2026-01-21

Mastering Cron Expressions: The 5 Fields and Special Characters with Examples

Understand Cron's 5 fields, special characters (* , - / ? L W #), common scheduling examples, and the UTC/timezone pitfalls—all explained with real expressions.

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A look inside DDL Builder, which turns a visually designed table into CREATE TABLE statements and an ER diagram. Covers the MySQL/PostgreSQL/SQLite type-mapping rules and the column-inference algorithm used for JSON samples.

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2026-07-21

GitHub Actions needs Design Patterns: Speed Up CI, Avoid the Anti-Patterns

A pattern reference for GitHub Actions job dependencies (needs). Covers diamond-shaped fan-out, concurrency cancellation, fail-fast tradeoffs, matrix-plus-needs gotchas, and reusable workflows, with copy-paste YAML examples.

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2026-07-21

SQL JOIN Types: Complete Reference to INNER, LEFT, RIGHT & FULL

A reference for SQL JOIN types (INNER/LEFT/RIGHT/FULL/CROSS/SELF) with a cheat sheet and row-count walkthroughs. Covers why one-to-many joins duplicate rows, the WHERE-vs-ON NULL trap, and how to write multi-table joins.

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Case Converter: camelCase, snake_case & kebab-case — 9 Styles at Once

Convert identifiers between camelCase, PascalCase, snake_case, CONSTANT_CASE, kebab-case and more — all nine styles side by side. Handles acronym runs like HTTPServer, digits, and bulk multi-line conversion.

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Every AI coding agent wants its own rules file. Compare AGENTS.md, CLAUDE.md, .cursor/rules, copilot-instructions.md and more — what to write, a copy-paste template, and how to stop them drifting apart.

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