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Convert Apache Airflow cron to Google Cloud Scheduler
Apache Airflow expressions look similar to Google Cloud Scheduler, but the differences matter. Paste yours below; the result is checked against the original run times.
What changes from Apache Airflow to Google Cloud Scheduler
- Google Cloud Scheduler has no
L,Wor#symbols. Schedules like "last day of the month" cannot be converted and are refused rather than silently changed.
Worked examples
| Schedule | Apache Airflow | Google Cloud Scheduler |
|---|---|---|
| every minute | * * * * * | * * * * * |
| every 5 minutes | */5 * * * * | */5 * * * * |
| every 10 minutes | */10 * * * * | */10 * * * * |
| every 15 minutes | */15 * * * * | */15 * * * * |
| every 30 minutes | */30 * * * * | */30 * * * * |
| every hour | 0 * * * * | 0 * * * * |
| every 2 hours | 0 */2 * * * | 0 */2 * * * |
| every 3 hours | 0 */3 * * * | 0 */3 * * * |
What cannot be converted
These common Apache Airflow schedules have no equivalent in Google Cloud Scheduler. The converter refuses them instead of guessing.
- on the last day of every month:
0 0 L * *. This schedule cannot be expressed in Google Cloud Scheduler: "L" is not a valid dom value. - on the first Monday of every month at 9:00 AM:
0 9 * * MON#1. This schedule cannot be expressed in Google Cloud Scheduler: "MON#1" is not a valid dow value.
Field layout and time zones
minute (0-59), hour (0-23), day-of-month (1-31), month (1-12), day-of-week (0-7, 0 and 7 = Sunday).
Airflow defaults to UTC. On a time-zone-aware DAG a cron schedule follows wall-clock time, so a daily 00:00 US/Eastern run moves between 04:00 and 05:00 UTC across daylight saving changes.
minute (0-59), hour (0-23), day-of-month (1-31), month (1-12), day-of-week (0-7, 0 and 7 = Sunday).
Cloud Scheduler takes any tz database zone (default UTC) and runs on wall-clock time, so daylight saving can make jobs run or not run unexpectedly. Google recommends UTC to avoid that.
Go the other way
Convert Google Cloud Scheduler to Apache Airflow, or open the Apache Airflow builder or the Google Cloud Scheduler builder.
Frequently asked questions
How do I convert a Apache Airflow cron expression to Google Cloud Scheduler?
Paste it into the converter above with Apache Airflow as the source and Google Cloud Scheduler as the target. For example, * * * * * becomes * * * * *.
Is every Apache Airflow expression convertible to Google Cloud Scheduler?
No. Out of 30 common schedules, 2 cannot be expressed in Google Cloud Scheduler: on the last day of every month; on the first Monday of every month at 9:00 AM.
Does Google Cloud Scheduler run in the same time zone as Apache Airflow?
Not necessarily. Conversion changes the syntax, not the time zone. Check where each system evaluates the schedule before you rely on the same clock times.