Timer Triggers in Azure Functions - NCRONTAB Expressions

Reference¶

The following information is adapted from here

Syntax¶

In an Azure Function app, a "scheduled job" is one that makes use of a Timer Trigger, as in the following example. This job will run at 5:30am UTC every day.

public static void Run([TimerTrigger("0 30 5 * * *")]TimerInfo myTimer, TraceWriter log)
{
}

The argument to the TimerTrigger attribute is an NCRONTAB expression, which utilizes the following syntax.

The expression consists of six fields: {second} {minute} {hour} {day} {month} {day-of-week}
Time of day are in the local time zone where the code runs. For a function app running in Azure, this is UTC (although there are ways to change this). When running the code locally, it will be in your local time zone.
Each field can be one of the following types
- Wildcard - an asterisk - indicates every value
- A specific value - indicates an exact match
  - Months and Days can be numeric, names, or 3-letter abbreviations. Names are English and case-insensitive.
  - Days: 0 to 6; 0 = Sunday
- A range of values - two values separated by a dash - indicates any value in the range, inclusively
- A set of values - a CSV list of values - indicates any values in the set
- An interval - */n - indicates any value evenly divisible by "n"