Getting started
Preview every event, time, location, and recurring date before you decide whether to import.
Browse guidesCalendarLint Guides
Learn how to open, check, understand, and safely repair ICS calendar files.
Getting startedOpen an ICS file without adding it to your calendar
Preview every event, time, location, and recurring date before you decide whether to import.
Read guideICS ViewerReview a calendar and open event detailsMove between calendar and list views, then inspect the original event details.
Read guideValidationFind the line that caused an import problemConnect a plain-language warning to the exact property in the file.
Read guideTimezones and DSTCheck why an event shows the wrong timeCompare the written time, timezone definition, and converted result.
Read guideRecurring eventsUnderstand a recurring eventPreview the dates created by an RRULE and the dates removed by exceptions.
Read guideCalendar app compatibilityCompare behavior across calendar appsReview known risks for Google Calendar, Apple Calendar, and Outlook.
Read guideSafe repairReview a repair before downloadingSee the exact line CalendarLint will change and keep the original file untouched.
Read guideLocal projects and comparisonsCompare two calendar file versionsSave a local baseline and review what changed between two versions.
Read guidePopular guides
Start with the tasks people use most often.
Browse all guide topics
Find instructions by tool or by the kind of calendar problem you are checking.
ICS Viewer
Move between calendar and list views, then inspect the original event details.
Browse guidesValidation
Connect a plain-language warning to the exact property in the file.
Browse guidesTimezones and DST
Compare the written time, timezone definition, and converted result.
Browse guidesRecurring events
Preview the dates created by an RRULE and the dates removed by exceptions.
Browse guidesCalendar app compatibility
Review known risks for Google Calendar, Apple Calendar, and Outlook.
Browse guidesSafe repair
See the exact line CalendarLint will change and keep the original file untouched.
Browse guidesLocal projects and comparisons
Save a local baseline and review what changed between two versions.
Browse guides