How to fill BS dates on government forms (without making the classic mistakes)
Citizenship, passport, school and tax forms in Nepal need BS dates. Avoid the three most common conversion mistakes with this short guide.
November 4, 2025 · 4 min read
Mistake 1: subtracting 57 every time
Many people compute BS dates by subtracting 57 from the AD year. This is wrong from January through mid-April, where the offset is actually 56. Always use a real converter; never rely on year arithmetic alone.
Mistake 2: ignoring the day of the week
Government forms sometimes require both the BS date and the day of the week. The day of the week is identical in both calendars (it's the same Sunday-Saturday cycle), but make sure you copy it from your converter, not guess.
Mistake 3: writing 32 days when there aren't 32
Some Nepali months have 32 days (the longest is usually Shrawan); most have 29, 30 or 31. Don't write a day that doesn't exist in that month — use a converter that validates the input.
Cross-check with your existing documents
If you already have a citizenship card or passport with your DOB in BS, double-check that your new form uses the same BS date. Inconsistencies between documents are the most common cause of rejected applications.
The fastest way to get an authoritative BS date is the AD to BS converter.