BS to AD / AD to BS Date Converter

The AD ↔ BS Date Converter converts dates between the Gregorian (AD) calendar and the Bikram Sambat (BS) calendar — Nepal's official national calendar. This conversion cannot be done by simple arithmetic; it requires a published table of month lengths for each year (since BS months vary from 29 to 32 days), making a reliable lookup tool essential for anyone working with both calendar systems.

Why this conversion is non-trivial

Many people assume converting between AD and BS is as simple as adding or subtracting approximately 56 years and 8 months. This estimate works for approximations but fails for precision. Because BS months have irregular lengths that differ year to year, the exact day difference between corresponding dates changes month by month. For example:

• 2080 Baisakh has 31 days
• 2080 Jestha has 31 days
• 2080 Ashadh has 32 days

This means the offset between AD and BS days is not constant — it shifts as months of different lengths pass. A lookup-table-based converter like UtilsGo's gives you the exact conversion.

Practical use cases

Official documents: Nepali government documents, land registration deeds, birth certificates, court judgments, and institutional records are dated in BS. A business receiving an old document dated in BS needs to find the Gregorian equivalent for international communication or legal recognition.

Festival and holiday planning: Nepali public holidays (Dashain, Tihar, Teej, Buddha Jayanti, Constitution Day) are fixed by BS date. Converting to AD tells you the corresponding Gregorian date for a specific year, which changes each year.

Expat and diaspora scheduling: Nepali communities abroad want to celebrate traditional festivals on the correct date in their local calendar. Converting the BS festival date to the Gregorian equivalent is necessary for planning.

Academic records: Nepali universities issue transcripts dated in BS. For foreign graduate school applications or credential evaluation (WES, ECE), the corresponding AD date is required.

Financial and banking records: Loan agreements, FD maturity dates, and insurance policy start dates written in BS need Gregorian equivalents for international banking and compliance reporting.

The converter supports both directions (AD → BS and BS → AD) for dates from the early 20th century to several years in the future. All computation runs in your browser.