Abstract: A system for sharing calendar information. The system may comprise a graphical user interface implemented on a computer for sharing calendar information with a third party residing at a remote site, the graphical user interface comprises a selection tool operable by a user on the computer for selecting a time range from a calendar program executed by the computer, the calendar program maintaining a schedule of events for the user over a certain time period. The time range is a subset of the certain time period, the time range being characterized by one or more free time slots within the time range, whereby the user is available for taking part in an activity. The time range is further characterized by one or more busy time slots within the time range, whereby the user is unavailable to take part in an activity. The selection tool causes the time range to be exposed to the third party residing at a remote site such that the third party can determine the free and busy timeslots.