Apple Calendar file
File type: Various data file
A calendarlocks file extension is used by Apple Calendar, Apple's calendar and scheduling application for macOS.
A calendarlocks file is an internal support file used by Apple Calendar rather than a calendar document intended for sharing.
File type category:
Various data file
Date updated: October 4, 2026
The calendarlocks file extension is associated with Apple Calendar, formerly known as iCal. Apple Calendar, supplied by Apple for macOS and earlier Mac OS X systems, helps users manage calendars, events, and schedules.
The calendarlocks file stores data used by Apple Calendar. It is an internal support file normally managed automatically by the application.
This file is not intended to be opened or edited as a standalone calendar document.
A calendarlocks file is not meant to be opened as a standalone document. Open Apple Calendar on a Mac and allow it to manage the file automatically. A text editor or another calendar application will not normally display useful calendar information from it.
A calendarlocks file cannot be meaningfully converted because it is an internal Apple Calendar support file, not a user-facing calendar format.
To move or share calendar data, open the calendar in Apple Calendar and use the application's export features. This exports the calendar data rather than converting the calendarlocks file itself.
Software applications that handle other tasks involving calendarlocks files:
Apple macOS / Mac OS X
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