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Indian calendars

The calculators for Hindu date conversions

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By the middle of the 20th century, more than 30 calendars were used in India's various regions. The calculator below displays a given date converted to some Indian calendars.

PLANETCALC, Hindu calendars

Hindu calendars

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To put an end to this mess, the Indian government commissioned scientists to develop a unified Indian calendar.
In 1955 the Indian Calendar Reform Committee completed the new National Indian Calendar. Its usage started officially on March, 22th 1957.
The following calculators convert a Gregorian date to the National Indian calendar date and vice versa.

PLANETCALC, Gregorian date to Indian National Calendar date

Gregorian date to Indian National Calendar date

Year
 
Month
 
Month name
 
Day
 

PLANETCALC, Indian national calendar to Gregorian date

Indian national calendar to Gregorian date

Gregorian date
 

However, the people of India did not accept the new calendar widely. The solar and lunisolar astronomical or true (spasta) calendars are in use actively at the moment. You can find below the solar and lunisolar Hindu calendar converters.

PLANETCALC, Gregorian date to Hindu true lunisolar calendar

Gregorian date to Hindu true lunisolar calendar

Year
 
Month
 
Leap month
 
Day
 
Leap day
 
Month name
 

PLANETCALC, Hindu true lunisolar calendar to Gregorian date

Hindu true lunisolar calendar to Gregorian date

Gregorian date
 

PLANETCALC, Gregorian date to Hindu true solar calendar

Gregorian date to Hindu true solar calendar

Year
 
Month
 
Day
 
Month name
 

PLANETCALC, Hindu true solar calendar to Gregorian date

Hindu true solar calendar to Gregorian date

Gregorian date
 

Each solar month begins when the Sun enters a new sign of the zodiac, the 30-degree sector of sidereal longitude. The sidereal longitudes are relative to the fixed stars. The longitude origin lays near the zeta Piscium, a binary star in constellation Pisces.
Each lunar month begins with a new moon (Sun and Moon conjunction). A lunar month receives its name after the zodiac sign which the Sun enters during this month. When no sign is entered during the month, then the month is considered a leap. Very rarely, it can be the occurrence of the solar month without moon conjunction. In this case, the corresponding lunar month is skipped1.

It is noteworthy that the calendrical calculations for the above four calculators are described in the Surya Siddhanta, the ancient astronomical treatise. The treatise explains the mathematical model of the heavenly bodies' motion around the static Earth. The following calculator illustrates this archaic model of the world.

PLANETCALC, Moon and Sun longitudes. Geocentric model.

Moon and Sun longitudes. Geocentric model.

 
:
:
Digits after the decimal point: 1
Moon longitude
 
Sun longitude
 
Moon age
 

Also please have a look at the calendar converters for other Hindu calendars (probably not so popular):

  • Mean solar calendar: to , from
  • Mean lunisolar calendar: to , from
  • Day count since Kali Yuga: to, from

Mean (madhyama) calendars, unlike astronomical or true (spasta) calendars use mean times, so they don't depend on astronomical events. The mean calendars were in use before 1100 C.E.


  1. N.Dershowitz, E.M. Reingold Calendrical Calculations Third edition 

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Creative Commons Attribution/Share-Alike License 3.0 (Unported) PLANETCALC, Indian calendars

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