Cron Studio

Available

Design cron schedules, explain every field, simulate future runs, test reliability and export deployment-ready scheduler configuration.

Schedule analysis stays in your browser

Cron expressionFive-field Unix syntax: minute hour day-of-month month day-of-week

Valid Unix schedule

Target scheduler

Simulated

Time zone

UTC+02:00Tue 01:43

422 IANA zones available. You can also type any IANA identifier supported by this runtime.

Estimated job duration (minutes)

Intent builder

Describe the schedule as an operational intent, preview the exact five-field expression, then apply it to the engineering workspace.

Unix source expression

Interval minutes

Fixed cadence options divide 60 evenly, avoiding a shorter gap when cron resets the minute field at the next hour.

Expression preview

*/15 * * * *

Visual field builder

Edit individual fields without losing direct access to the cron expression.

Minute

Hour

Day of month

Month

Day of week

Interactive explanation

Select a field to connect the expression with its scheduling meaning.

Cron quick reference

Read five-field cron precisely, then compare the parts that change across production schedulers instead of assuming every cron dialect behaves the same way.

Current target

Unix / crontab

Minute

0-59

Allowed: 0-59
Aliases: —

*/15

Hour

0-23

Allowed: 0-23
Aliases: —

9-17

Day of month

1-31

Allowed: 1-31
Aliases: —

1,15

Month

1-12

Allowed: 1-12
Aliases: JAN-DEC

JAN,MAR,SEP

Day of week

0-7

Allowed: 0-7
Aliases: SUN-SAT

MON-FRI

Next executions

Upcoming instants calculated using the selected time zone.

Reference: Oct 6, 2026, 1:43 AM

Reliability analyzer

Portability matrix

Simulation is Unix-based. Other targets are analyzed or exported without pretending to run their native engine.

Target export

Generate a starting configuration for the selected scheduler.

Send to

Compatible tools

JSON Studio Regex Lab Base64 Studio Timestamp Studio Text Diff UUID Studio Data Converter

Overlap policyCatch-up windowCommand / job placeholder

# crontab timezone is host/daemon configuration; ensure it evaluates in Europe/Madrid.
*/15 9-17 * * 1-5 ./job.sh

File: devkit-crontab.txt

Schedule library

Start from curated operational recipes and load their schedule context into the workspace.

Every 5 minutes

Run a lightweight recurring task every five minutes.

*/5 * * * *

Weekdays at 09:00

Run once each weekday at the start of the working day.

0 9 * * 1-5

Every 15 minutes during working hours

Run every quarter hour from 09:00 through 17:59 on weekdays.

*/15 9-17 * * 1-5

Daily at midnight

Run once per day at local midnight.

0 0 * * *

Sunday backup

Run a weekly backup every Sunday at 02:30.

30 2 * * 0

Monthly report

Generate a report at 08:00 on the first day of each month.

0 8 1 * *

Hourly health check

Run a health check at the top of every hour.

0 * * * *

Nightly maintenance

Run maintenance at 03:15 every day.

15 3 * * *

Schedule unit tests

Assert whether a specific UTC instant should or should not trigger the current schedule.

Add assertions to protect a production schedule from regressions.

Schedule simulation

Preview upcoming runs in a selected time zone and inspect DST-sensitive behavior before deployment.

Deployment targets

Check portability and generate configuration for Unix cron, GitHub Actions, Kubernetes, Dagu, Quartz and AWS EventBridge.

Browser-first

Parsing, tests and simulation run locally. Cron Studio designs schedules; it does not execute production jobs.