Google Calendar Delphi Component is a non-visual component that allows to work with Google Calendar using Delphi. The component supports Delphi 7 and higher versions and works directly with Google using most current Google API v3. Official API use guarantees maximum compatibility and fewest possible modifications to future versions.

Features
Create and edit calendars (all properties supported, including colors, sharing, time zones and location)
Create and edit events (all properties supported, including colors, reminders, recurring and all day events)
Extensive calendars sharing support: adding users, setting access rights
Incremental synchronization support
Add Google Drive attachments to events
Full OAuth 2.0 authentication support (including two-step verification)
Access to JSON code for each object with possibility to read and modify any fields for an object
Unicode support for all text fields
Batch storing of changes
HTTP, SSL, SOCKS4, SOCKS5 proxy servers support

Examples
Connecting to Google Calendar and showing list of calendars in listbox.

GCalendars := TGCalendars.Create;
GCalendars.LoadCalendars;
for I := 0 to GCalendars.CalendarCount - 1 do
  ListBox1.Items.Add(GCalendars.Calendars[I].Name);
GCalendars.Free;

Adding a new event starting April, 20, 2013 at 10:00, ending at 10:30 with a title "Meeting John".

with GCalendars[0].NewEvent do
begin
  StartTime := EncodeDate(2013, 4, 20) + EncodeTime(10, 0, 0, 0);
  EndTime := EncodeDate(2013, 4, 20) + EncodeTime(10, 30, 0, 0);
  Title := 'Meeting John';
  Store;
end;

Deleting event with index number 5.

GCalendars[0].DeleteEvent(5);

Only for V.I.P