The Rana rulers of Nepal made Vikram Samvat the official Hindu calendar in 1901 CE , which started as Samvat 1958 . In Nepal , the new year begins with the first day of the month of Baishakh , which usually falls within the months of April -- May in the Gregorian calendar . The first day of the new year is passionately celebrated in a historical carnival that takes place every year in Bhaktapur , called Bisket Jatra.As before , from 2007 AD Nepal Sambat is recognized as the national calender .

Question: in which country bikram sambhat the official calender
Answer: Nepal