Why Nepali date converters disagree, and how we checked ours

A Bikram Sambat month can have 29, 30, 31 or 32 days, and the lengths change from year to year. They follow the sun’s movement and are decided and published every year by the Nepal Panchanga Nirnayak Bikas Samiti. There is no formula. Every date converter therefore carries a table of month lengths, and when two tables differ, so do their dates.

Where the differences come from

Tables are often copied from each other. A typo in one month, or an old projection for a year that has since been published, spreads to every copy. Because the months come in pairs (one a day short, the next a day long), the year still adds up, and Baisakh 1 and Shrawan 1 still look right, while the dates in between are a day off.

How we checked ours

For 2081, 2082 and 2083 we read the printed calendars month by month: the national panchang for 2082 and 2083, and the Surya Panchanga for 2081. On each page we read the solar day (गते) and the AD date. Every month boundary in our table matches them. For example, Constitution Day 2082 (Asoj 3) fell on 19 September 2025.

For earlier years, our table agrees with the consensus of many independent published tables.

Where we are honest about doubt

• BS 2062: published tables disagree about Baisakh and Jestha 2062 (14 May to 14 June 2005). Our converter marks those days as possibly one day different.
• After BS 2083: no official calendar is published yet, so those years are marked provisional.

Try the Nepali date converter.