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Software

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"