Internet Calendaring and Scheduling Core Object Specification (iCalendar) introduces a new format for calendaring and scheduling applications. Without a common format, there will be interoperability problems between dissimilar applications that are not supporting the same format for defining the calendar information. Different organizations and commercial vendors develop their own calendaring and scheduling model and structures. If the calendar representation format is not interoperable, calendar applications can not communicate with each other even if they are in the same organization or they are coming from the same commercial vendor. To solve interoperability problems, The Internet Engineering Task Force (IETF) introduced some standards by publishing specifications for the calendar data exchange(RFC-2445). IETF is an open community of network designers, operators, vendors, and researchers for every interested individual.