Vikram Samvat, also known as the Vikrami calendar is a national Hindu calendar historically used in the Indian subcontinent and still also used in several Indian states and Nepal. It is a solar calendar, using twelve to thirteen lunar months each solar sidereal years. The year count of the Vikram Samvat calendar is usually 57 years ahead of the Gregorian calendar, except during January to April, when it is ahead by 56 years.