Hindu calendar is a collective name for most of the lunisolar calendars and solar calendars used in India since ancient times. 


The Hindu calendar also high lights the hindu festivals, the celebration which honours the hindu deities etc…


Since ancient times it has undergone many changes in the process of regionalization and today there are several regional Indian Hindu calendars. 

It has also been standardized as Indian national calendar. 
Nepali calendar, Assamese Calendar, Bengali calendar, Malayalam calendar, Tamil calendar, Telugu calendar, Kannada calendar etc. are some prominent regional Hindu calendars.

The common feature of all regional Hindu calendars is that the names of the twelve months are the same (because the names are based in Sanskrit) though the spelling and pronunciation have come to vary slightly from region to region over thousands of years. 

The month which starts the year also varies from region to region. 

The Buddhist calendar and the traditional lunisolar calendars of Cambodia, Laos, Myanmar, Sri Lanka and Thailand are also based on an older version of the Hindu calendar.