DevCraft
100% Private — All processing happens locally in your browser.

Cron Expression Parser

Parse cron expressions into plain English and see upcoming execution times.

FreeNo SignupNo UploadsNo Tracking

Cron Expression Parser

Parse cron expressions into plain English and see upcoming execution times. All processing happens in your browser.

Cron Expressionmin hour day month weekday
DescriptionAt 9:00 AM on Monday, Tuesday, Wednesday, Thursday, Friday
Next 10 Executions

No upcoming executions found

Schedule Grid
Days of Week
Sun
Mon
Tue
Wed
Thu
Fri
Sat
Hours (0-23)
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
Minutes (0-59)
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
Embed code
<iframe src="https://devally.dev/embed/cron-parser" width="100%" height="600" frameborder="0" title="Cron Expression Parser - devcraft"></iframe>
<p style="font-size:12px;text-align:center;margin-top:4px;">
  <a href="https://devally.dev/tools/cron-parser" target="_blank" rel="noopener">Powered by devcraft</a>
</p>
Attribution preview

Powered by devcraft

How to Use Cron Expression Parser

  1. 1

    Enter a cron expression

    Type a cron expression in the input field or select a common preset from the dropdown.

  2. 2

    Read the description

    See a plain-English description of what your cron expression means.

  3. 3

    Check next executions

    View the next 10 scheduled execution times based on your current time zone.

  4. 4

    Use the visual grid

    See which days, hours, and minutes are active in the schedule grid.

Frequently Asked Questions

Standard 5-field cron (minute, hour, day of month, month, day of week) and extended 6-field cron with seconds.

Yes. Switch to the Build tab to enter values for each field and see the generated cron expression.

Yes. All next execution times are calculated and displayed in your browser's local time zone.

No. All parsing and calculations happen entirely in your browser. No data leaves your machine.

Related Tools

Timestamp Converter

Convert Unix timestamps to human-readable dates

UUID Generator

Generate random UUID v4 identifiers

Regex Tester

Test regular expressions with real-time matching

JSON Formatter

Format, validate, and minify JSON

Cron Syntax Explained

A standard cron expression has 5 fields: minute (0-59), hour (0-23), day of month (1-31), month (1-12), and day of week (0-7, where both 0 and 7 are Sunday). Each field accepts specific values, ranges (1-5), lists (1,3,5), and step values (*/5 means "every 5"). The expression 0 9 * * 1-5 means "at 9:00 AM, Monday through Friday" — a common schedule for business-hours jobs.

Common Cron Pitfalls

The most dangerous mistake is * * * * * — which runs every single minute. In a CI/CD pipeline or cloud function, this can generate massive bills overnight. Another subtle bug: day-of-month and day-of-week interact with OR logic in standard cron, meaning 0 9 15 * 1 runs on the 15th AND every Monday, not on Mondays that fall on the 15th. This catches many developers off guard.

Cron in Different Environments

AWS CloudWatch and GitHub Actions use a 6-field format with seconds as the first field. Kubernetes CronJobs use the standard 5-field format. Spring Boot uses a 6-field format (seconds, minutes, hours, day, month, weekday). Always check which cron flavor your platform uses — a schedule that works in one system may behave differently or fail to parse in another.