Auto delete previous / old events from iOS 7 Calendar?
There are two things you can do about this, one on the device and one on iCloud.com:
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On the device, you can setup to sync the calendar only for the events in the past two weeks (that's the shortest duration in the past you can set it to).
- Do this by going to Settings → Mail, Contacts, Calendars
- Under the Calendars section, go to the Sync submenu
- Select Events 2 Weeks Back
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Login to iCloud.com, go to Calendar and follow Apple's help on "Delete or hide events":
To automatically hide past events, choose Preferences from the Action pop-up menu
, click Advanced, select “Hide events n-days after they’ve passed,” then enter a number of days. Set it to 1 day (that's the minimum allowed).