vikram samvat is official calendar of which contry
Vikram Samvat Vikram Samvat (Nepali: विक्रम सम्वत्) (abbreviated as V.S. (or VS) or B.S. (or BS));  Listen (help·info)) is the historical and official Hindu calendar of Nepal. It uses lunar months and solar sidereal year (see: Vedic time keeping).
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Vikramashila Vikramashila was founded by