In some embodiments, the present invention provides for a computer-implemented method, including at least the following steps to be performed by a specifically programmed computer processor of a schedule management computer system: electronically causing to display a specialized schedule GUI; where the specialized schedule GUI is configured to allow each user to: define a programmed schedule object, including a plurality of availability time periods (TimeWindows); each having TimeWindow parameters, and identifying when a time period is available or unavailable for booking; where the TimeWindow parameters include: a start date, a start time, an end time, at least one day of a week, and a period type; electronically and in real-time, generating a bitmask of days in a week for each TimeWindow of the TimeWindows; electronically and in real-time, storing schedule objects associated with the users in a specifically dedicated database.