CalDAV
An internet standard protocol for calendar extensions, used by clients to access and synchronize calendar data. It is a relatively universal open standard for cross-platform calendar interoperability.
Core Facts
Timeline (last 90 days)
Interoperation among multiple calendar systems requires implementing independent authorization, read, and write logic for each platform, and handling mapping differences in fields such as time zones, recurrence rules (RRULE), and reminder lead time.
Events created directly via CalDAV or the iCloud API are written to the iCloud database, supporting two-way editing, conflict resolution, and local notification push.
Self-hosted calendars generally adopt a separated server-client architecture, where the server exposes an interface via CalDAV and the client syncs with the server through CalDAV
DAVx⁵ (formerly known as DAVdroid) is currently recognized as the most reliable CalDAV sync adapter for Android, responsible for bridging server-side data to the local calendar on the phone
CalDAV is an open-standard calendar protocol based on WebDAV that supports cross-platform calendar synchronization.
Google Calendar and Apple Calendar natively support CalDAV, while Microsoft Outlook uses its own Exchange ActiveSync or Microsoft Graph API.
现代日历系统大多基于 iCalendar（RFC 5545）标准格式存储事件数据，跨平台同步依赖 CalDAV 协议
All Facts (7)
CalDAV is an open-standard calendar protocol based on WebDAV that supports cross-platform calendar synchronization.
65%UnverifiedGoogle Calendar and Apple Calendar natively support CalDAV, while Microsoft Outlook uses its own Exchange ActiveSync or Microsoft Graph API.
60%UnverifiedInteroperation among multiple calendar systems requires implementing independent authorization, read, and write logic for each platform, and handling mapping differences in fields such as time zones, recurrence rules (RRULE), and reminder lead time.
50%UnverifiedEvents created directly via CalDAV or the iCloud API are written to the iCloud database, supporting two-way editing, conflict resolution, and local notification push.
50%UnverifiedSelf-hosted calendars generally adopt a separated server-client architecture, where the server exposes an interface via CalDAV and the client syncs with the server through CalDAV
50%UnverifiedDAVx⁵ (formerly known as DAVdroid) is currently recognized as the most reliable CalDAV sync adapter for Android, responsible for bridging server-side data to the local calendar on the phone
50%Unverified现代日历系统大多基于 iCalendar（RFC 5545）标准格式存储事件数据，跨平台同步依赖 CalDAV 协议
50%