Addtocalendar

Addtocalendar is a web utility designed to provide Add to Calendar functionality on websites. It enables event organizers to offer visitors a straightforward way to add event details to their preferred calendar applications, including Google Calendar, Apple Calendar, Microsoft Outlook, and Yahoo Calendar.

Typically implemented as a JavaScript component or plugin, addtocalendar reads event information from HTML attributes or a data model. Key data include the event title, start and end times, location, time zone, and a description. When a user activates the Add to Calendar option, the library constructs calendar entries or URLs and prompts the user to add the event to their calendar. In practice, this can involve opening a Google Calendar URL with prefilled parameters or generating and downloading an ICS (iCalendar) file that can be imported by calendar apps.

The library supports multiple delivery methods for calendar data, such as direct ICS file downloads and calendar URL schemes. This allows compatibility with a range of platforms, including Google Calendar, Apple Calendar, Outlook, and Yahoo Calendar. Time zone handling and date formatting are important considerations, and correct usage typically relies on standard formats like ISO 8601 for times.

Addtocalendar is typically used by event listings, conference sites, and venues to improve event engagement by reducing friction for adding events to personal calendars. It is open-source and distributed under licenses that vary by version. See also ICS/iCalendar, Google Calendar, and calendar integration tooling.