iCal files rejected by Google Calendar or Outlook Calendar

Here are a few possible reasons why iCal files generated by some other tools might be rejected by Google Calendar or Outlook Calendar.

Files generated by iCal Studio tools are always ensured to be conformant, so this Help Article is meant for debugging issues with other tools you may be using.

• Check whether there are any hidden characters in the calendar fields. If any exist, ensure they are trimmed away before importing.
• Incorrect line folding (iCal lines shouldn’t exceed 75 octets).
• Missing required fields such as UID and DTSTAMP.

Forcing the sort order for all-day events

Since iCal clients typically sorts all-day events alphabetically, users often implement hacks (like adding special characters or numbers to the title) to keep specific tasks at the top.