The Hindu Calendar
This calendar has continued to change as a result of the process of regionalization.
The Hindu calendar can be traced back to the early centuries after the birth of Christ. Through centuries that followed many individuals contributed to the calendar system and in that way it has been an ever-evolving calendar system. The calendar system is not uniform however, there are many variations of the Hindu calendar, known as the Surya Siddhanta. As recently as 1952, it was noted that over thirty variations of the calendar were used in different regions throughout India.
The Hindu calendar has been subject to many changes as years have passed, but at its most basic core, it is not a great deal different from the calendars of western cultures. One level of the calendar is Vaasara, this can be equivocated to days of the week, and similar to the western calendar there are seven. The Hindu calendar also consists of 12 months, but the difference arises when the concept of "extra months" are introduced. Hindu months only consist of 29-30 days which creates a surplus of 9-10 days every year which becomes an extra month every three years. In addition to the concept of extra months, the Hindu calendar differs from the traditional western calendar with its use of a cycle of 60 calendar year names.
Also check out our info on the Catholic Calendar