Cron Expression Builder

Build cron expressions visually. See the next run dates and human-readable description.

Minute

Hour

Day of month

Month

Day of week

Description: Every minute

Timezone:

Next 10 runs

#	Date & Time	Relative

Quick Reference

Field	Allowed values	Special chars
Minute	0-59	* , - /
Hour	0-23	* , - /
Day of month	1-31	* , - / ?
Month	1-12 or JAN-DEC	* , - /
Day of week	0-6 or SUN-SAT	* , - / ? L #

Special characters

Char	Meaning	Example
`*`	Any value	* in minute = every minute
`,`	List separator	1,15 in minute = min 1 and 15
`-`	Range	1-5 in hour = hours 1 through 5
`/`	Step	*/5 in minute = every 5 minutes
`L`	Last	L in DOM = last day of month
`#`	Nth	2#1 in DOW = first Monday

Export

Generates a .timer and .service file pair. Place both in /etc/systemd/system/ (or ~/.config/systemd/user/), then run systemctl daemon-reload and systemctl enable --now <name>.timer.

myjob.timer

myjob.service

Note: The OnCalendar field uses systemd calendar syntax. Edit ExecStart= in the .service file to point to your script or command.

AWS EventBridge rule in JSON format. Use with the AWS CLI, CloudFormation, or the EventBridge console. The cron expression uses AWS 6-field format (with year). Either day-of-month or day-of-week must be ?.

eventbridge-rule.json

Note: Replace the Target ARN and Role ARN placeholders with your actual values. Add "State": "ENABLED" when you are ready to activate the rule.

AWS EventBridge rule in YAML format for use with CloudFormation or the Serverless Framework.

eventbridge-rule.yaml

Note: This is a CloudFormation resource definition. Include it in your template’s Resources section and replace the placeholder ARNs.

GCP Cloud Scheduler job using the gcloud CLI. The schedule uses standard 5-field cron syntax. Timezone is taken from the builder’s timezone selector.

gcloud scheduler command

job.json (for --from-file)

Note: Replace the URI, HTTP method, and body placeholders with your actual endpoint details. The --time-zone flag uses IANA timezone names (e.g. America/New_York).

Kubernetes CronJob manifest in YAML format. Apply with kubectl apply -f cronjob.yaml. Replace the container image and command placeholders.

cronjob.yaml

Note: The concurrencyPolicy, startingDeadlineSeconds, and suspend fields are set to common defaults. Adjust them to match your workload requirements.