what is Vcalendar

VCalendar (Virtual Calendar) is an open source Web calendar application with related tools, for posting and maintaining events and schedules online, in calendar format. This is an excellent and free solution for use by online Web communities and any commercial and non-commercial organizations. Unlike any other online calendars, VCalendar comes with source code in multiple programming languages: PHP, ASP and ASP.NET (C# and VB.NET); with potential for adding more technologies in the future.

vCalendar is an industry standard format for exchanging scheduling and activity-recording information electronically. If someone sends you their week's schedule in a vCalendar attachment to an e-mail note, you can drag-and drop it (or otherwise move it) to a personal information manager (PIM) type of application program and integrate with or relate it to your own schedule. vCalendar was developed along with the vCard electronic business card specification.

Like vCard, vCalendar was developed by a consortium founded by Apple, AT&T, IBM, and Siemens. The specification was turned over to an industry group, the Internet Mail Consortium (IMC), in 1996. Like vCard, vCalendar requires that you have an application program that supports its use. In time, it's expected that most personal information manager programs on all computer software platforms will support vCard and vCalendar as a standard exchange format.

Key Features:
Some of the advanced features of VCalendar include:
1. Localization features, with initial Internationalization in English and Russian, with language selectable by end-users
2. Dynamic CCS (stylesheet) styles, selectable by end-users
3. Annual, monthly, weekly and daily calendar views
4. Multiple categories for classifying calendar events
5. Recurring and all-day events
6. Role-based user permissions and calendar configuration