You can subscribe to your ActivityTimeline schedule in Apple Calendar using a personal iCal feed.
To connect your calendar:
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In ActivityTimeline, go to My Account → Calendar Integration.
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Click Renew Calendar Link to generate your unique iCal Datafeed URL.
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Copy the generated URL.
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Open Apple Calendar.
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Go to File → New Calendar Subscription.
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Paste the iCal URL and click Subscribe.
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Enter a name for the calendar.
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Set Auto-refresh to Every hour.
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Click OK.
Scheduled Jira issues and ActivityTimeline events from your timeline will then appear in Apple Calendar.
Because the calendar uses a subscription feed, updates may not appear immediately and depend on the selected refresh interval.