When do you need date-difference in BS?

Several practical situations in Nepal call for exact day counts between two Bikram Sambat dates:

Calculating a contract duration (government contracts run in BS dates)
Finding how many days remain until a tax deadline
Counting days for a probation or leave entitlement period in employment
Checking whether a property registration or tender period is still open
Figuring out how many days until a festival or auspicious occasion

The challenge with BS month arithmetic

In the Gregorian calendar, month lengths are almost fixed (28–31 days) so simple arithmetic is predictable. In Bikram Sambat, month lengths vary from 29 to 32 days and the lengths themselves change from year to year. You cannot reliably count by saying "three months = 90 days" in BS — it might be 88 or 93 depending on which months are involved.

How the date-difference tool works

The date-difference calculator converts both input BS dates to a day count from the same epoch, then subtracts. The result is always exact regardless of month boundaries or year boundaries. The tool also breaks down the span into years, months and remaining days for readability.

Working with durations across the new year

A common source of confusion: a duration that spans 1 Baisakh. The year changes but the day count is continuous — 30 Chaitra 2082 and 1 Baisakh 2083 are consecutive days, just as 31 December and 1 January are in the Gregorian calendar. The date-difference tool handles this correctly regardless of year boundary.

Converting the result to AD

If you need the same duration expressed in AD terms, the answer is identical — the number of days between two calendar dates is the same regardless of which calendar system you use to specify those dates. Seven days is seven days in both BS and AD.