Subscription Calendar Update Frequency

This help doc explains how often events update in a calendar subscriber's calendar.

When your users follow your subscription calendar, a unique URL for your calendar is stored in the user's calendar client (Google Calendar, Outlook, Exchange, Apple Calendar, etc). That unique URL is regularly requested by that calendar client to sync with your subscription calendar. When this happens, any changes you have made to your subscription calendar are synced with your followers' calendars, so their calendars stay up-to-date!

The frequency of this request/sync depends entirely upon the calendar client. Below we have provided the historical sync frequency for each of the major calendar clients:

  • Apple updates upon app/program startup & every 1-3 hours.
  • Google normally updates every 24 hours.
  • Outlook updates upon app/program startup & every 1-3 hours.
  • Outlook.com updates every 3 hours.
  • Yahoo updates every 8-12 hours.

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What triggers calendars/events to sync?

Making changes to the following details of an event will trigger your subscription calendars to sync with your subscriber's calendars:

  • Title
  • Date
  • Time
  • Location
  • Description