Google Calendar

Google Calendar API v3 provides comprehensive RESTful access to calendar management with OAuth 2.0 authentication. Supports 40 endpoints covering events, calendars, ACL, settings, free/busy queries, and attendee management.

Core functionality includes creating, reading, updating, and deleting events with support for single and recurring events, reminders, attachments (Google Drive files), and attendee management. Advanced features include working location management, out-of-office events, focus time, birthday events with Google Contacts integration, and conference data for Google Meet and Hangouts.

Webhooks via push notifications enable real-time calendar change tracking with support for specific event type subscriptions. Free/busy queries for scheduling. Access control rules for calendar sharing permissions. Color customization for calendars and events.

Official client libraries for JavaScript, Python, Java, PHP, C#, and Ruby. Comprehensive developer documentation with quickstarts and code samples. Rate limiting with recommended exponential backoff implementation. Free to use. Production environment only. Ideal for scheduling applications, project management tools, productivity apps, and calendar synchronization solutions.