Reading a BS date
A Bikram Sambat date is written year-month-day, for example 2083-04-01 or 1 Shrawan 2083. The twelve months are Baisakh, Jestha, Asar, Shrawan, Bhadra, Asoj, Kartik, Mangsir, Poush, Magh, Falgun and Chaitra. Baisakh starts in mid-April and Chaitra ends in mid-April of the next AD year, so one BS year spans parts of two AD years.
Each month has 29 to 32 days, and the same month can have a different length in different years. That is why the day list changes when you pick a month: Asar 2083 has 32 days, while Poush usually has 29 or 30.
How the conversion works
The converter finds the AD date of 1 Baisakh in your chosen year, adds the lengths of the months before your month, then adds the day of the month minus one.
Worked example: 1 Shrawan 2083. 1 Baisakh 2083 was 14 April 2026. Baisakh, Jestha and Asar 2083 have 31 + 31 + 32 = 94 days, and 14 April 2026 plus 94 days is 17 July 2026, a Friday. That day is also the first day of fiscal year 2083/84.
Where it matters
Most deadlines in Nepali engineering work are issued in BS: bid submission dates, contract completion dates, extensions of time, defects liability periods and the validity of bank guarantees. Scheduling tools, email and foreign partners work in AD, so a wrong conversion can mean a missed deadline. The days-from-today figure shows how much time is left, and the fiscal year shows which year's budget and district rates apply.
Common mistakes
Picking a day that doesn't exist, such as 32 Poush: this tool only offers the days each month really has. Mixing up months whose names are spelled in different ways, such as Asar (Ashad) and Asoj (Ashwin), or Shrawan (Saun) and Chaitra (Chait). Assuming the fiscal year matches the BS year: it runs from 1 Shrawan to the last day of Asar, so a date in Jestha 2083 falls in fiscal year 2082/83.
Dates in future years are provisional until the Nepal Panchang Nirnayak Samiti publishes the calendar for that year. Recheck a far-off deadline once the official calendar is out.