The Science of Nepali Date Conversion (मिति रूपान्तरण)
Nepal's official civil calendar is Bikram Sambat (BS), a lunisolar calendar that originated in the Indian subcontinent and was adopted as Nepal's national calendar under the Rana era. Bikram Sambat is approximately 56 years, 8 months, and 17 days ahead of the Western Gregorian calendar (AD).
Unlike the Gregorian calendar where month lengths are fixed (30 or 31 days, and 28/29 for February), the length of months in Bikram Sambat varies every year between 29 and 32 days. This variance occurs because Bikram Sambat months begin on the exact moment the sun enters a new zodiac sign (Sankranti), which is tied to the sun's variable orbital velocity across the celestial sphere.
As a result, mathematically converting between BS and AD cannot be solved by adding a static day-count offset. Our date converter relies on a verified dataset of historical astronomical coordinates spanning 2000 BS to 2090 BS (1944 AD to 2034 AD), guaranteeing exact 1-to-1 conversion for bank checks, administrative forms, academic admissions, and legal documentation.