Vikram Samvat (IAST: Vikrama Samvat), abbreviated V.S. (or VS) and B.S. (or BS)) Listen (help·info)) and also known as the Vikrami calendar, is the historical Hindu calendar on the Indian subcontinent and the official calendar of Nepal. It is also used in several Indian states. The calendar uses lunar months and solar sidereal years.
A number of ancient and medieval inscriptions used the Vikram Samvat. Although it was reportedly named after the legendary king Vikramaditya, the term "Vikrama Samvat" does not appear in the historical record before the 9th century; the same calendar system is found with other names, such as Krita and Malava. In colonial scholarship, the era was believed to be based on the commemoration of King Vikramaditya expelling the Sakas from Ujjain. However, later epigraphical evidence and scholarship suggest that this theory has no historical basis. During the 9th century, epigraphical artwork began using Vikram Samvat (suggesting that the Hindu calendar era in use became popular as Vikram Samvat); Buddhist and Jain epigraphy continued to use an era based on the Buddha or the Mahavira.
Kalakacharya Kathanaka (An account of the monk Kalakacharya), by the Jain sage Mahesarasuri, gives the following account: Gandharvasena, the then-powerful king of Ujjain, abducted a nun called Sarasvati, who was the sister of the monk. The enraged monk sought the help of the Śaka ruler King Sahi in Sistan. Despite heavy odds but aided by miracles, the Śaka king defeated Gandharvasena and made him a captive. Sarasvati was repatriated, although Gandharvasena himself was forgiven. The defeated king retired to the forest, where he was killed by a tiger. His son, Vikramaditya, being brought up in the forest, had to rule from Pratishthana (modern Paithan in Maharashtra). Later on, Vikramaditya invaded Ujjain and drove away from the Śakas. To commemorate this event, he started a new era called the "Vikrama era". The Ujjain calendar started around 58–56 BCE, and the subsequent Shaka-era calendar was started in 78 CE at Pratishthana.[full citation needed]
The association of the era beginning in 57 BCE with Vikramaditya is not found in any source before the 9th century CE; earlier sources call the era "Kṛṭa" (343 and 371 CE), "Kritaa" (404), "the era of the Malava tribe" (424), or simply "Samvat". The earliest known inscription which calls the era "Vikrama" is from 842. This inscription, from the Chauhana ruler Chandamahasena, was found at Dholpur and is dated "Vikrama Samvat 898, Vaishakha Shukla 2, Chanda" (16 April 842). The earliest known inscription which associates the era with a king called Vikramaditya is dated 971, and the earliest literary work connecting the era to Vikramaditya is Subhashita-Ratna-Sandoha (993-994) by the Jain author Amitagati.
A number of authors believe that the Vikram Samvat was not started by Vikramaditya, who might be a legendary king or a title adopted by a later king who renamed the era after himself. V. A. Smith and D. R. Bhandarkar believed that Chandragupta II adopted the title of Vikramaditya, and changed the era's name to "Vikrama Samvat". According to Rudolf Hoernlé, the king responsible for this change was Yashodharman. Hoernlé believed that he conquered Kashmir and is the "Harsha Vikramaditya" mentioned in Kalhana's Rajatarangini.
Some earlier scholars believed that the Vikraa Samvat corresponded to the Azes era of the Indo-Scythian (Śaka) king King Azes. This was disputed by Robert Bracey after the discovery of an inscription of Vijayamitra, which is dated in two eras. The theory was discredited by Falk and Bennett, who place the inception of the Azes era in 47–46 BCE.
The Vikram Samvat has been used by Hindus and Sikhs. One of several regional Hindu calendars in use on the Indian subcontinent, it is based on twelve synodic lunar months and 365 solar days. The lunar year begins with the new moon of the month of Chaitra. This day, known as Chaitra Sukhladi, is a restricted holiday in India.[failed verification]
The calendar remains in use by Hindus in Nepal and north, west and central India. In south India and portions of east and west India (such as Assam, West Bengal and Gujarat), the Indian national calendar is widely used.
With the arrival of Islamic rule, the Hijri calendar became the official calendar of sultanates and the Mughal Empire. During British colonial rule of the Indian subcontinent, the Gregorian calendar was adopted and is commonly used in urban areas of India. The predominantly-Muslim countries of Pakistan and Bangladesh have used the Islamic calendar since 1947, but older texts included the Vikram Samvat and Gregorian calendars. In 2003, the India-based Sikh Shiromani Gurdwara Parbandhak Committee controversially adopted the Nanakshahi calendar. The Vikram Samvat is the official calendar of Nepal.
The Vikram Samvat is similar in design to the Gregorian calendar, but differs from the Hebrew calendar. Unlike the Gregorian calendar, which adds days to the lunar month to adjust for the mismatch between twelve lunar cycles (354 lunar days) and nearly 365 solar days, the Vikram Samvat and Hebrew calendars maintain the integrity of the lunar month and insert an extra month every four years to ensure that festivals and crop-related rituals fall in the appropriate season. The Vikram Samvat is one of the lunisolar calendars developed by ancient human cultures. Early Buddhist communities in India adopted the ancient Hindu calendar, followed by the Vikram Samvat and local Buddhist calendars. Buddhist festivals are still scheduled according to a lunar system.
The Vikram Samvat has two systems. It began in 56 BCE in the southern Hindu calendar system (purnimanta) and 57–56 BCE in the northern system (amanta). The Shukla Paksha, when most festivals occur, coincides in both systems. The lunisolar Vikram Samvat calendar is 56.7 years ahead of the solar Gregorian calendar; the year 2075 VS began in 2018 CE, and will end in 2019 CE.
The Rana dynasty of Nepal made the Vikram Samvat the official Hindu calendar in 1901, which began as Samvat 1958. The new year in Nepal begins with the first day of the month of Baishakh, which usually falls around 13–15 April in the Gregorian calendar. The first day of the new year is celebrated in Bisket Jatra, an annual carnival in Bhaktapur. In 2007, Nepal Sambat was recognized as the national calendar.
In India, the reformulated Saka calendar is officially used (except for computing dates of the traditional festivals). In the Hindi version of the preamble of the constitution of India, the date of its adoption (26 November 1949) is presented in Vikram Samvat as Margsheersh Shukla Saptami Samvat 2006. A call has been made for the Vikram Samvat to replace the Saka calendar as India's official calendar.
Divisions of a year
The Vikram Samvat uses lunar months and solar sidereal years. Because 12 months do not match a sidereal year, correctional months (adhika māsa) are added or (occasionally) subtracted (kshaya masa). A lunar year consists of 12 months, and each month has two fortnights. The lunar days are called tithis. Each month has 30 tithis, which vary from 20 to 27 hours. During the waxing phase, beginning with the day after the new moon (amavasya) tithis are called shukla (the bright phase, or auspicious fortnight). Tithis of the waning phase are called krishna (the dark phase, considered inauspicious).
- A Tithi (or lunar day) is defined as the time it takes for the longitudinal angle between the Moon and the Sun to increase by 12°. Tithis begin at varying times of day and vary in duration from approximately 19 to 26 hours.
- A Paksa (also Pakṣa) or lunar fortnight consists of 15 tithis.
- A Māsa or lunar month (approximately 29.5 days) is divided into 2 Pakṣas: the one between new moon and full moon (waxing) is called gaura (bright) or Śukla Pakṣa; the one between full moon and new moon (waning) Kṛiṣhṇa (dark) or Vadhya Pakṣa
- A Ṛitu (or season) is two Māsa
- An Ayana is three Ṛitus
- A year is two Ayanas 
- Chaitra - March-April
- Vaiśākha - April-May
- Jyaiṣṭha - May-June
- Asādha - June-July
- Srāvana - July-August
- Bhādrapada - August-September
- Asvinā - September-October
- Kārtikā - October-November
- Agrahāyaṇa - November-December
- Pauṣa- December-January
- Māgha - January-February
- Phālguna- February-March
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