cron(...), always six fields, and the day-of-month / day-of-week conflict always resolved with ?.View future cron matches in a calendar
Showing next 1000 cron schedules
cron(MIN HOUR DOM MONTH DOW YEAR) cron( 0 9 ? * MON-FRI * )
?, L, W, L-N?, L, #*)cron(* * * * ? *) — every minutecron(*/5 * * * ? *) — every 5 minutescron(*/15 * * * ? *) — every 15 minutescron(0 * * * ? *) — every hourcron(0 9 * * ? *) — daily at 09:00 UTCcron(0 9 ? * MON-FRI *) — weekdays at 09:00cron(0 0 1 * ? *) — first of every month at midnightcron(0 0 L * ? *) — last day of every month at midnightcron(0 9 ? * 6L *) — last Friday of every month at 09:00cron(0 9 ? * 2#1 *) — first Monday of every month at 09:00import * as events from 'aws-cdk-lib/aws-events';
import * as targets from 'aws-cdk-lib/aws-events-targets';
new events.Rule(this, 'WeekdayMorningRule', {
schedule: events.Schedule.expression('cron(0 9 ? * MON-FRI *)'),
targets: [new targets.LambdaFunction(myLambda)],
});For the newer EventBridge Scheduler:
import * as scheduler from 'aws-cdk-lib/aws-scheduler';
new scheduler.CfnSchedule(this, 'WeekdayMorningSchedule', {
scheduleExpression: 'cron(0 9 ? * MON-FRI *)',
scheduleExpressionTimezone: 'America/New_York',
flexibleTimeWindow: { mode: 'OFF' },
target: { arn: myLambda.functionArn, roleArn: schedulerRole.roleArn },
});*.ScheduleExpressionTimezone for local time.? in one.Six: minute, hour, day-of-month, month, day-of-week, year. The expression is wrapped in `cron(...)`. Standard 5-field Unix crontab is rejected — you must include the year (use `*` for every year).
AWS follows the Quartz convention: you can specify either day-of-month or day-of-week as a value, but not both. Exactly one must be `?` (no specific value). The most common pattern is `cron(0 9 * * ? *)` (every day at 09:00) or `cron(0 9 ? * MON-FRI *)` (every weekday at 09:00).
`rate(N minutes)` (or hours, days) creates a schedule that fires N units after creation, not aligned to the clock. Use it for jobs that don't care about clock alignment. Use `cron(...)` when you need predictable wall-clock fires (e.g., 09:00 every weekday).
By default, all EventBridge Rules run in UTC. The newer EventBridge Scheduler (a separate service) supports a `ScheduleExpressionTimezone` parameter — pass an IANA timezone like 'America/New_York' to schedule in local time.
EventBridge Rules is the original service. EventBridge Scheduler is the newer dedicated scheduler with timezone support, one-off schedules, higher throughput limits and dead-letter queue configuration. Both accept the same `cron(...)` syntax.
AWS supports `?` (no specific value), `L` (last day of month or last weekday), `#` (Nth weekday of month, e.g. `2#1` = first Monday), and the standard wildcards (`*`, `,`, `-`, `/`). It does NOT support `W` (nearest weekday).
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