---
title: "Cron Expression Parser - Parse cron expressions and preview scheduled runs"
description: "Parse cron expression fields and show a plain-language description of when it runs, along with upcoming run times. Supports the standard five-field format (minute hour day month weekday), including *, ?, comma-separated values, ranges, steps, and month or weekday names. Use it to check cron expressions before adding them to a schedule."
canonical_url: "https://web-toolbox.dev/en/tools/cron-parser"
meta:
author: K
"og:description": "Parse cron expression fields and show a plain-language description of when it runs, along with upcoming run times. Supports the standard five-field format (minute hour day month weekday), including *, ?, comma-separated values, ranges, steps, and month or weekday names. Use it to check cron expressions before adding them to a schedule."
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"og:image:alt": "Cron Expression Parser"
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"og:title": "Cron Expression Parser - Parse cron expressions and preview scheduled runs"
---
> Index of every page on this site: [llms.txt](https://web-toolbox.dev/llms.txt)
# **Cron Expression Parser**
Parse cron expressions and preview upcoming runs
**Cron expression**
Fields in order: minute, hour, day of month, month, day of week
Common expressions
## **What this expression does**
**Every 5 minutes**
## **Next scheduled runs**
## **Field details**
- **Minute **0-59
- */5
- 0, 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55
- **Hour **0-23
- *
- all
- **Day of month **1-31
- *
- all
- **Month **1-12
- *
- all
- **Day of week **0-7
- *
- all
## What Is the Cron Expression Parser?
Cron expressions are used in crontabs, CI pipelines, and job schedulers to define when a job runs. An expression like `**0 9 * * 1-5**` is hard to read at a glance; it is not obvious when it will actually run.
This tool turns the expression into a description such as "weekdays at 09:00" and shows the next run times. For `**0 0 1 * ***`, it shows "day 1 of every month at 00:00." The field breakdown also shows how each part expands. That makes it easier to check day-of-month and day-of-week settings before adding the expression to a schedule.
## How to Use
1. Enter the cron expression you want to check.
2. The description and the next five run times appear.
3. Check the parsed fields to see how each part is expanded.
Starting from a common expression saves you from typing it out.
## Supported Formats
The tool supports the standard five-field format (`**minute hour day month weekday**`). Values can be listed with commas, and ranges can be combined with steps (for example, `**0 9-17/2 * * ***`).
| **Symbol** | **Meaning** | **Example** |
| --- | --- | --- |
| `*****` | Any value | `*** * * * ***` (every minute) |
| `**?**` | Any value (same as `*****`) | `**? * * * ***` (every minute) |
| `**,**` | Value list | `**0,15,30,45 * * * ***` |
| `**-**` | Value range | `**0 9-17 * * ***` |
| `**/**` | Step values | `***/5 * * * ***` (every 5 minutes) |
Each field accepts the following values.
| **Field** | **Range** | **Names** |
| --- | --- | --- |
| Minute | 0-59 | None |
| Hour | 0-23 | None |
| Day of month | 1-31 | None |
| Month | 1-12 | `**JAN**` through `**DEC**` |
| Day of week | 0-7 | `**SUN**` through `**SAT**` (0 and 7 are Sunday) |
Month and weekday names are case-insensitive.
## Use Cases
- Checking that a cron expression runs on the intended days and times before adding it to a crontab or CI schedule
- Confirming that a combined day-of-month and day-of-week expression does not run on more days than expected
- Reviewing cron expressions with your team and checking the description alongside the next run times
- Checking whether month-end or leap-year settings produce the dates you expect
## Things to Keep in Mind
- Only the five-field format is supported; expressions with a seconds field are not.
- When both day of month and day of week are set, a run happens on a day that matches either condition.
- Times use your browser's local time zone. Results can differ if the server uses another time zone.
- Upcoming runs are calculated up to five years ahead. If an expression has no run within five years, the tool says so.
**How was your experience?**
Last updated: October 31, 2026
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