Airtable currently supports the importing and exporting of .ics calendar files, but the calendar view doesn’t properly support displaying all-day events — even when those all day events are perfectly formatted to the .ics standard.
The calendar view incorrectly displays all-day events as blocking out all 24 hours of the day, instead of simply displaying the all day event at the top of the day.
This applies to both:
All-day events that take up one day. (The workaround for this is to make the start date & end date perfectly identical to each other, or just make the event a small 15 or 30 minute event.)
All-day events that take up multiple days. (The workaround for this is to break up the event into multiple records.)
The latest thread which discusses this problem is located here.