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Azure Functions timer (NCRONTAB)

six fields · UTC by default · WEBSITE_TIME_ZONE

Type the schedule of an Azure Functions timer trigger. See what it means, when it fires in UTC or in the zone set by WEBSITE_TIME_ZONE, and copy the binding for function.json, C# or JavaScript.

How to write an Azure Functions timer schedule

1. Type the expression with six fields, seconds first. 0 */5 * * * * is every five minutes; five-field expressions are accepted too.
2. Leave the zone on UTC, the default, or pick the zone you set in WEBSITE_TIME_ZONE. Check that your plan supports it (table below).
3. Read the meaning and the next runs. Azure's NCRONTAB has no ?, L, W or #, and the checker says so if you use them.
4. Copy the binding for your programming model: function.json, the C# isolated worker attribute, or the JavaScript v4 app.timer call.
5. Starting from a Linux crontab line? Paste it under Convert from Linux cron.

NCRONTAB fields

Each field takes *, lists (,), ranges (-) and steps (/). When day and day-of-week are both set, both must match: 0 0 0 1 * 1 runs only when the 1st is a Monday.

Time zones and hosting plans

Timer schedules are evaluated in UTC unless the app setting WEBSITE_TIME_ZONE says otherwise, and what it accepts depends on the plan:

From Linux cron to NCRONTAB

Add a seconds field in front (30 9 * * 1-5 becomes 0 30 9 * * 1-5) and write Sunday as 0, since Azure rejects 7. As with Spring, a Linux line that sets both day fields means "either" on Linux and "both" on Azure, so the converter splits it into two schedules, one per function. The same line for other schedulers is on cron to code.

FAQ

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