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Convert Azure Functions cron to Crontab
Azure Functions expressions look similar to Crontab, but the differences matter. Paste yours below; the result is checked against the original run times.
What changes from Azure Functions to Crontab
- Crontab has no seconds field, so a schedule that fires on specific seconds cannot be converted exactly. The seconds value is dropped and flagged.
- Azure Functions requires both day fields to match; Crontab fires when either does. Schedules that restrict both are flagged.
Worked examples
| Schedule | Azure Functions | Crontab |
|---|---|---|
| every minute | 0 * * * * * | * * * * * |
| every 5 minutes | 0 */5 * * * * | */5 * * * * |
| every 10 minutes | 0 */10 * * * * | */10 * * * * |
| every 15 minutes | 0 */15 * * * * | */15 * * * * |
| every 30 minutes | 0 */30 * * * * | */30 * * * * |
| every hour | 0 0 * * * * | 0 * * * * |
| every 2 hours | 0 0 */2 * * * | 0 */2 * * * |
| every 3 hours | 0 0 */3 * * * | 0 */3 * * * |
Conversions that come with a warning
- every 10 seconds:
*/10 * * * * *→* * * * *. Unix / crontab (5-field) has no seconds field; the seconds value "*/10" was dropped. - every 30 seconds:
*/30 * * * * *→* * * * *. Unix / crontab (5-field) has no seconds field; the seconds value "*/30" was dropped.
Field layout and time zones
second (0-59), minute (0-59), hour (0-23), day-of-month (1-31), month (1-12), day-of-week (0-6, 0 = Sunday).
Azure Functions evaluates NCRONTAB in UTC unless the WEBSITE_TIME_ZONE app setting is set; with it, the schedule adjusts for daylight saving. The setting is not supported on Linux Consumption or Flex Consumption plans.
minute (0-59), hour (0-23), day-of-month (1-31), month (1-12), day-of-week (0-7, 0 and 7 = Sunday).
Cron runs in the server's local time zone. Check it with the date command, or put CRON_TZ=Asia/Kolkata above the line on cronie-based systems.
Go the other way
Convert Crontab to Azure Functions, or open the Azure Functions builder or the Crontab builder.
Frequently asked questions
How do I convert a Azure Functions cron expression to Crontab?
Paste it into the converter above with Azure Functions as the source and Crontab as the target. For example, 0 * * * * * becomes * * * * *.
Is every Azure Functions expression convertible to Crontab?
Yes for the common schedules we tested (29 of 29), though unusual expressions with special characters might need manual review.
Does Crontab run in the same time zone as Azure Functions?
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.