BS ↔ AD Converter

The Bikram Sambat (BS) calendar runs roughly 56 years and 8 months ahead of the Gregorian (AD) calendar, though the exact gap shifts slightly depending on the time of year since BS New Year falls in mid-April.

The calendar data was fully replaced and re-verified after an earlier data-reliability issue (the old dataset turned out to be built from a repeating 4-year template pattern instead of real per-year data). The replacement was cross-checked against two independently-built converters and confirmed against real-world dates that have nothing to do with any calendar library — including the 2015 Gorkha earthquake (documented as Baisakh 12, 2072) and the last several Nepali New Years. That said, we're not a government source: for anything legally binding, always confirm against an official document or the relevant government office.

Unlike the fixed Gregorian calendar, Bikram Sambat is based on the actual position of the sun and moon, so each month's exact length (29–32 days) is set by astronomical calculation and can shift slightly from year to year.

Baisakh 1, the Nepali New Year, falls in mid-April on the Gregorian calendar — usually April 13 or 14, depending on the year.