While opening an ICS file with a text editor is not the best way to view an event's details, it does allow you to view the information without a calendar application. For example, you can see the event's start and end times (including time zone) listed in the file's DTSTART and DTEND lines. If you are having trouble importing your ICS file into a calendar application, you can open the file in any text editor, such as Microsoft Notepad (Windows) or Apple TextEdit (Mac), to view the event information it contains. The event(s) it contains will be added to your calendar.

Select Import and import your ICS file.

Click the Gear icon that appears in the program's upper right-hand side.

For example, to import an event into the web version of Google Calendar: It can be used with read-only access to publ. If necessary, you can also manually import an ICS file into your calendar app. Sync Google Calendar with Mozilla® Thunderbird Lightning: Google Calendar is a great tool for time management.

For example, if you have a calendar application, such as Microsoft Outlook, Google Calendar, or Apple Calendar, installed on your device, you can double-click an ICS file to import the event details the file contains into your calendar. You can open an ICS file with various applications.

Add google calendar to thunderbird