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Timer Triggers in Azure Functions - NCRONTAB Expressions

Modified on Tue, Dec 31, 2019, 8:13 AM by Administrator Categorized as Azure, ┬ĚNet Framework


The following information is adapted from here


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 UTC - although there are ways to change this.
  • 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"

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