Sushma had her DV Lottery interview scheduled in Kathmandu. She had waited two years for this appointment. She walked in with her documents, sat down, and the officer looked at her entry form. He asked her to confirm her date of birth.
She said the date. The officer looked again at the DS-260 she had submitted online. The dates did not match. Not by a year. Not by a month. By a single day.
Her original DV registration had used the wrong AD date because she had converted her BS birth date by hand, using the "subtract 57" shortcut that everyone uses. She had been born in Poush, near the end of the Nepali year. The shortcut had put her AD date in the wrong year. The one-day error had carried through every form she had filled since then.
Her interview was paused. She needed to submit a correction affidavit explaining the discrepancy. It added four months to the process.
The conversion itself takes 20 seconds with the right tool. This guide makes sure you do it right the first time.
Free Merokalam Tool
Nepali Date Converter (BS to AD and AD to BS)
Convert your BS birth date to AD instantly. Shows the result in English and Nepali Devanagari, with the day of the week. Free, no login, no installation. Works on any phone or computer.
Convert My Birth Date Now →
56-57
Years that BS runs ahead of AD. Not a fixed number, which is why shortcuts fail.
12
BS months in a year. Each has a different number of days that changes every year.
20 sec
How long an accurate conversion takes using the right tool.
1 day
How much of a mismatch can cause document rejection. Even one day matters on official forms.
Why Your Nepali Birth Date Looks So Different from English Dates
Before we get into the steps, let us spend two minutes understanding why this conversion is needed at all. You do not need to be an expert. You just need enough background to avoid the common errors.
Nepal officially uses the Bikram Sambat (BS) calendar. It has been Nepal's official government calendar since 1901 AD (1958 BS), when the government standardized it for all records, courts, and documents. Every Nepali citizenship certificate, land deed, birth registration, and government notice uses BS.
The rest of the world uses the Gregorian calendar, which is also called AD (Anno Domini) or CE (Common Era). Passport agencies, embassies, universities, and foreign banks all work in AD.
These two calendars are not just offset by a fixed number of years. They are built differently:
The two key differences between BS and AD
The year gap is not fixed. BS runs roughly 56 years and 8 months ahead of AD. But the exact gap is either 56 or 57 years depending on what time of the BS year you were born. Someone born in Baisakh (first month of BS) and someone born in Chaitra (last month of BS) in the same BS year can have AD birth years that are 12 months apart.
BS months change length every year. In AD, February always has 28 or 29 days, January always has 31, and so on. In BS, the number of days in each month is calculated from astronomical positions and changes every year. Baisakh might have 31 days one year and 32 the next. This means there is no formula for conversion. You need a lookup table. That is what the converter uses.
This is why you cannot convert a BS birth date by subtracting 57 and calling it done. You get the year approximately right, but the day and month can be completely wrong. On a passport or visa form, "approximately right" is not acceptable.
Step 1: Find Your BS Birth Date on Your Citizenship Certificate
Before you open any converter, you need to read your BS birth date correctly. This sounds simple, but there are two things that trip people up.
Where to look on your citizenship certificate
Your Nepali citizenship certificate (nagarikta) shows your date of birth in the format:
Typical citizenship certificate format
जन्म मिति: २०५६ साल माघ १५ गते
This reads as: Birth date: 2056 BS, month of Magh, 15th day
Or in Arabic numerals:
Also common on newer citizenship certificates
जन्म मिति: 2056-10-15
Year 2056 BS, 10th month (Magh is the 10th month), day 15. Note: the number 10 refers to Magh's position in the BS calendar, not any month in AD.
Write down three things from your citizenship: the year, the month name (or month number), and the day. You need all three. The year alone is not enough.
What if your citizenship shows Devanagari numerals?
Some older citizenship documents show dates entirely in Devanagari script numerals. The Merokalam converter accepts Arabic numerals (0 to 9), so you need to convert the Devanagari digits first. This is straightforward because the mapping is one-to-one:
०0
१1
२2
३3
४4
५5
६6
७7
८8
९9
So if your citizenship shows २०५६, that is 2056. If it shows १५, that is 15. Read each Devanagari digit and replace it with the Arabic equivalent, left to right.
Steps 2 to 7: How to Convert Your Birth Date (Full Walkthrough)
We will use 2056 BS, Magh 15 as the example throughout. This is a common birth year for Nepalis now in their mid-twenties.
2
Open the Merokalam Nepali Date Converter
Go to
merokalam.com/nepali-date-converter/ in any browser on your phone or computer. The page opens with a clean converter. No login, no app installation, no account needed. Look for two tabs at the top:
BS to AD and
AD to BS. Click
BS to AD since you are converting your Nepali citizenship date to English.
3
Enter the BS year
In the Year field, type the BS year from your citizenship. For our example, type 2056. Do not add anything else. Just the four-digit year number. If your citizenship shows the year in Devanagari (like २०५६), convert each digit using the chart above and type the Arabic version.
4
Select your birth month from the dropdown
Click the Month dropdown. You will see all 12 Nepali months listed in order from Baisakh to Chaitra. Select the month that matches your citizenship. For our example, select Magh. If your citizenship shows a month number (like 10 for Magh), count down the list: Baisakh is 1, Jestha is 2, Ashad is 3, Shrawan is 4, Bhadra is 5, Ashoj is 6, Kartik is 7, Mangsir is 8, Poush is 9, Magh is 10, Falgun is 11, Chaitra is 12.
5
Enter the day number
In the Day field, type the day number from your citizenship. For our example, type 15. Again, if it is in Devanagari (like १५), convert to Arabic first. The day field accepts numbers from 1 to 32 for BS (some BS months have up to 32 days, which is more than any AD month). Do not be surprised if your citizenship shows a day like 31 or 32. Those are valid BS dates.
6
Click Convert and read the result
Click the Convert button. The result appears immediately. You will see the full AD date in English, the day of the week, and the same date written in Devanagari Nepali script. For 2056 BS Magh 15, the result is January 28, 2000 AD (Friday). This is the date you use on all official foreign documents from this point.
7
Copy the result and use it
The converter has a Copy button. Click it to copy the formatted date to your clipboard. You can then paste it directly into your passport application form, your DS-160 form, your university enrollment, or whatever document you are filling. Do not retype it. Copy and paste to avoid any chance of a typo. Write the result down somewhere permanent (your phone notes, a document you save) so you have it ready for every form from now on.
The example result: 2056 Magh 15 BS = January 28, 2000 AD (Friday)
This is the date that would go on the passport application form, the DS-160 US visa form, university enrollment forms, and any other official document that asks for the date of birth in English. Use January 28, 2000 consistently across every document. Never change it unless you have reason to believe the original conversion was wrong.
Three Real Examples: BS to AD Birth Date Conversion
Here are three more complete examples covering different birth months and years. These show you how the pattern works across different parts of the Nepali calendar.
Example 1: Born in Baisakh (start of BS year)
2049 BS Baisakh 12 → April 25, 1992 AD (Saturday)
Baisakh falls in mid-April to mid-May in AD. A Baisakh birthday in BS 2049 lands in April 1992. The BS year 2049 gives an AD year of either 1992 or 1993 depending on the month, not always just 2049 minus 57 = 1992.
Example 2: Born in Chaitra (last month of BS year, high-error zone)
2063 BS Chaitra 22 → April 4, 2007 AD (Wednesday)
Chaitra runs from mid-March to mid-April in AD. Someone born in Chaitra 2063 BS was born in 2007 AD, which is 2063 minus 56, not 2063 minus 57. This is exactly where the shortcut breaks. Chaitra sits in the AD year that is only 56 years behind the BS year, not 57. Many people born in Chaitra have the wrong AD year on their documents because of this.
Example 3: Born in Poush (winter BS month)
2057 BS Poush 1 → December 16, 2000 AD (Saturday)
Poush falls in mid-December to mid-January in AD. The 1st of Poush in BS 2057 lands in December 2000. This is 57 years earlier than 2057 when you count it, but the exact day depends on the month-length dataset for 2057 BS, not on any shortcut.
Save your converted date in two places. Write it in your phone's notes app and in a simple text file on your computer or in Google Drive. Label it clearly. You will need this date on every future visa form, bank account abroad, scholarship application, and NRN registration. Having it saved means you never have to convert again and never risk using a different date by mistake.
The 5 Mistakes That Create Problems on Official Documents
These are not rare or unusual errors. They come up repeatedly among Nepalis applying for passports, visas, and university admissions. Read each one carefully before you submit any form.
Mistake 1
Writing the BS year directly on an AD form
If your citizenship says you were born in 2056 BS and you write 2056 on a form asking for your birth year in AD, you have given a year that is 57 years in the future. No verification system will accept it as a valid birth year. This sounds like an obvious error, but it happens more often than you would expect, especially on forms filled late at night or under time pressure. Always confirm which calendar system the form is asking for. Forms saying "Date of Birth (English calendar)" or "Date of Birth (AD)" want the Gregorian date, not the BS date.
Mistake 2
Using "subtract 57" as the final answer instead of just a rough check
Subtracting 57 from your BS year gives you an approximate AD year. It is not a conversion. The day and month can both be wrong. For someone born in Chaitra, even the year can be wrong (should be minus 56 in that part of the BS calendar). The shortcut is only safe for a rough guess, like confirming you were born "around 1999 or 2000." For any document that will be officially submitted, always use the converter. The conversion takes the same amount of time as the subtraction, so there is no reason to use the shortcut.
Mistake 3
Assuming BS months align neatly with AD months
Many people assume Baisakh equals April, Jestha equals May, and so on. This is approximately true only for the start of each month. Baisakh 1 falls around April 13 or 14. But because each BS month has a variable number of days (sometimes 32), the month does not end neatly at mid-May. If someone's birthday is Jestha 25, that might be June 7 or June 8 depending on the year, not the "middle of May" that a rough guess would suggest. Never estimate a day-level date by matching month names.
Mistake 4
Converting independently for each form and getting slightly different results
This happens when someone converts their date using one tool for the passport, then re-converts using a different tool or method for a visa form, and ends up with dates that are one day apart. Consular officers and document verification systems flag date discrepancies even when they are just one day off. Convert once, verify the result, write it down, and use that same date on every document forever. Do not re-convert unless there is a specific reason to doubt the original result.
Mistake 5
Using a date converter with an old or unreliable dataset
Not all online BS to AD converters use the same underlying data. BS month lengths vary by year and must be stored in a verified reference table. Some converters use older or incomplete datasets and can be off by one or two days for certain dates. The Merokalam Nepali Date Converter uses the same dataset used by Nepal's major banks, calendar apps, and e-governance portals. If you ever get a result that seems wrong, you can cross-check against the official Patro (Nepali almanac) for that year, but in practice the converter's results are reliable.
Converting Your Birth Date for Each Document Type
Different documents have slightly different requirements. Here is what matters for each one.
Nepali Passport Application
The Department of Immigration's passport application form asks for your date of birth in both BS and AD. The BS date comes from your citizenship certificate. The AD date is what you convert.
Get this right because your passport will carry the AD date internationally for its full 10-year validity. Every visa, every border crossing, every background check in any foreign country will reference this date. If it is wrong on the passport, it is wrong on everything that follows. Correcting a passport error after it is issued requires a formal application to the Department of Immigration with supporting documents and takes additional weeks.
One more thing: the AD date on your passport and the AD date on every other document you ever submit abroad must match exactly. If your university enrollment shows January 28 and your visa application shows January 27, you have a discrepancy that will need explaining.
US Visa Applications (B1/B2 Tourist, F1 Student, H1B Work)
All US visa applications require your date of birth in the Gregorian (AD) calendar. The date on your visa form must exactly match the date printed on your passport. So if you have already correctly converted your date for the passport, use that same date on every US visa form. Do not re-convert independently.
The DS-160 form (used for most non-immigrant US visas) asks for date of birth in Month/Day/Year format. If your converted date is January 28, 2000, enter it as 01/28/2000. Pay attention to the format the form requests, some ask for Day/Month/Year instead.
DV Lottery (Diversity Visa)
The DV Lottery registration has a strict consistency requirement. The date of birth you enter at the time of initial registration must exactly match what is on your passport and what you present at the interview. Discrepancies between any of these have caused disqualifications at the interview stage, even after winning the lottery.
If you are filling the DV registration for the first time and do not yet have a passport, convert your BS birth date carefully and use the AD result. Then when you apply for your passport, use the same converted date. Do not let different dates appear on different documents at any point in the process.
DV Lottery: consistency matters more than anything else
The US State Department and USAFIS check the initial registration details against all subsequent documents. Name spelling, birth date, place of birth, and country of chargeability must all match. If your DV registration shows February 3 and your passport shows February 4, you have a problem. This is not automatically disqualifying, but it requires a correction affidavit and adds time to the process. Convert once. Verify. Write it down. Use it everywhere.
University Enrollment Forms and WES Credential Evaluation
Nepali students applying to universities in the US, UK, Australia, Canada, and other countries often need to submit their academic transcripts. SLC, SEE, and higher education marksheets from Nepali schools sometimes record dates in BS. For WES (World Education Services) and ECE credential evaluations, you may need to provide AD date equivalents for these records.
In most cases, you provide the original document with the BS date and the institution handles verification. But if you are asked to supply a specific AD date for an SLC year or a passing date, convert the relevant BS date using the same tool.
Lok Sewa Aayog (Public Service Commission) Applications and Deadlines
This works in reverse. Lok Sewa Aayog announces all deadlines, results, and examination schedules in BS. If you are a Nepali living abroad and need to track these dates against your AD calendar or work schedule, use the AD to BS tab of the converter in reverse: enter the Lok Sewa deadline in BS and get the AD equivalent to add to your phone calendar.
Land Registration Documents and Lalpurja
Nepal's land records (Malpot) use BS throughout. If you are an NRN managing property from abroad or involved in an inheritance or sale that requires documentation in a foreign legal system, you may need to provide AD equivalents for dates on your lalpurja, purchase deed (raji-namaa), or inheritance documents. The same conversion process applies to these dates.
Date Conversion for the Nepali Diaspora: Specific Situations
Nepalis living outside Nepal face some additional scenarios that are worth covering specifically.
Children born abroad to Nepali parents
When Nepali parents register a child's birth at a Nepali embassy or consulate abroad, the registration records the birth date in both AD and BS. The AD date comes from the foreign birth certificate. The BS equivalent is calculated and recorded at the consulate.
If that child later applies for a Nepali citizenship certificate, the citizenship will show the BS date. When using that citizenship for a Nepali passport or other documents, parents should cross-check the BS date against the original foreign birth certificate's AD date to confirm the conversion was recorded correctly. If there is any doubt, run the BS date from the citizenship through the converter and compare with the AD date on the foreign birth certificate.
Elderly parents applying for tourist visas to visit family abroad
Older Nepali citizens often have handwritten citizenship certificates with dates in Devanagari numerals only. They may also have older documents where the month is written in a less common transliteration (like Baishak instead of Baisakh, or Aswin instead of Ashoj).
The process is the same: read the Devanagari numerals using the chart above, identify the month, and run the conversion. For older documents where the birth date may have been approximately recorded (a common issue with older Nepali births, where the exact date was sometimes rounded to the nearest easy date), it is worth checking whether the date on the citizenship matches any other available records like a baptism certificate, school enrollment, or a sibling's birth record that might help confirm the right year and month.
NRN card and NRN bank account applications
Non-Resident Nepali (NRN) card applications and NRN-linked bank account openings require KYC (Know Your Customer) documents. These often ask for both BS and AD dates for birth certificates, citizenship, and property documents. Having your birth date converted accurately and consistently recorded before starting these processes saves significant back-and-forth.
Historical birth dates for older family members
Some diaspora Nepalis need to establish birth dates for parents or grandparents whose citizenship certificates show birth years in the 1990s to 2010s BS range (roughly AD 1933 to AD 1953). The Merokalam converter covers BS 2000 onward (AD 1943 April 14 onward). For birth dates before BS 2000, you would need a historical calendar reference or the Nepal National Archives, as the pre-2000 BS period requires more specialized datasets.
The 12 Nepali Months: Quick Reference for Every BS Month
Here is a stable reference. These are approximate AD overlaps for each BS month. They are close enough for orientation but not precise enough for official documents, so always use the converter for any date that will be submitted.
Baisakh बैशाख
Mid-April to mid-May
Jestha जेठ
Mid-May to mid-June
Ashad असार
Mid-June to mid-July
Shrawan साउन
Mid-July to mid-August
Bhadra भदौ
Mid-August to mid-September
Ashoj असोज
Mid-September to mid-October
Kartik कार्तिक
Mid-October to mid-November
Mangsir मंसिर
Mid-November to mid-December
Poush पौष
Mid-December to mid-January
Magh माघ
Mid-January to mid-February
Falgun फागुन
Mid-February to mid-March
Chaitra चैत
Mid-March to mid-April
Chaitra is the highest-risk month for conversion errors. Because Chaitra falls at the very end of the BS year but overlaps with March and April in AD, people born in Chaitra often end up with the wrong AD year when they use the shortcut method. Someone born in Chaitra 2063 BS was born in 2007 AD, which is 2063 minus 56, not 2063 minus 57. Always run the full conversion for Chaitra birthdays.
What Actually Happens If the Date Is Wrong
This is the part people most want to know. What are the real consequences?
For a Nepali passport application: The Department of Immigration cross-checks the BS date on your citizenship against the AD date you entered. If they do not match, your application is flagged. You will be called in for clarification or asked to submit an affidavit explaining the discrepancy. This adds time and sometimes cost. The fix is usually straightforward but it delays the passport.
For a US visa DS-160 application: The consular officer at the interview will verify your birth date against your passport. If they differ, the officer asks about it. A small typographical error is usually cleared up at the window. A larger discrepancy, like a different day or month, leads to follow-up questions and potentially a request for additional documents. In some cases it leads to administrative processing (AP) which delays the visa decision by weeks or months.
For the DV Lottery: The State Department and the Kentucky Consular Center (KCC) compare the date you entered in the initial registration against your passport and then against your DS-260 form. Any mismatch triggers a request for clarification. The worst case is disqualification at the interview stage after you have already done everything else correctly. This is what happened to Sushma, the person in the opening story.
For university applications and credential evaluations: Institutions like WES and ECE have seen document inconsistencies before. A date mismatch on a marksheet versus a citizenship usually triggers a request for an explanation letter from your institution. It adds processing time but is generally resolvable.
None of these situations are irreversible. But every one of them adds time, cost, and anxiety that is entirely avoidable. The conversion takes 20 seconds. The fix takes weeks.
Frequently Asked Questions
My citizenship shows a number like 10 for the month, not a name. What month is 10? +
The number refers to the BS month's position in the calendar. Count from Baisakh as month 1: Baisakh (1), Jestha (2), Ashad (3), Shrawan (4), Bhadra (5), Ashoj (6), Kartik (7), Mangsir (8), Poush (9), Magh (10), Falgun (11), Chaitra (12). So if your citizenship shows month 10, that is Magh. Month 5 is Bhadra. Month 12 is Chaitra. Select the corresponding month name in the converter dropdown.
Can I convert multiple dates at once, like for a whole family? +
The Merokalam converter handles one date at a time. For a family, convert each person's birth date separately and write down each result with the person's name next to it. Keep this in a shared document (like a Google Doc or a notes app) that all family members can access. This saves time on every future form and ensures everyone uses the same date consistently. For families applying together for visas or other documents, having all dates pre-converted and recorded prevents last-minute confusion.
The converted date does not match what I have been using on old documents. What do I do? +
First, double-check your input. Make sure you entered the correct BS year, month, and day from your citizenship certificate. If the converter result still differs from what you have been using, you may have a discrepancy on your existing documents. At this point, the most important thing is to pick one date, verify it against your citizenship certificate using the converter, and use that consistently going forward. For documents that already exist with the old date (like an old university transcript), a simple letter of explanation is usually sufficient to clarify the discrepancy. For high-stakes documents like a passport, the date on your citizenship certificate converted accurately should be treated as the correct date.
My citizenship certificate date and my birth registration certificate (janam darta) show different BS dates. Which one do I use? +
This is a real problem for some Nepali citizens, where the birth registration and the citizenship were filled out years apart and the dates do not match. For passport purposes, the citizenship certificate (nagarikta) is the primary document and its date takes precedence. For the passport application, use the date on the citizenship certificate converted to AD. If there is a conflict that needs resolving for legal purposes, you would need to go to the Ward Office (ward karyalaya) or the District Administration Office (jilla prashasan karyalaya) to have the discrepancy formally corrected on one of the documents.
Does the day of the week shown by the converter matter for official forms? +
Very occasionally. Most forms only ask for the date (day, month, year). A few government and bank forms, particularly for registrations in Nepal, also ask for the day of the week (like Budhbar for Wednesday, or Saturday). The converter shows the day of the week in both English and Nepali automatically with every result, so you have it ready if any form needs it. For most foreign visa applications, you will only need the numeric date.
Is there a way to verify the converter result independently? +
Yes. The most reliable cross-check is the official Nepali Patro (almanac) for the relevant BS year. Physical Patro almanacs are published every year and show the exact BS to AD correspondence for each day of each month. The other option is to ask at a Nepal Rastra Bank, a large Nepali commercial bank, or at the Department of Immigration, which all have access to official BS calendar data. In practice, the Merokalam converter uses the same verified dataset used by these institutions, so it is reliable for any date within its coverage range (BS 2000 to 2090).
One Final Thought Before You Fill the Form
Sushma's situation was entirely preventable. Not because she was careless. She had prepared for months. The problem was that she trusted a shortcut that looked correct but was not exact.
The Bikram Sambat calendar is not a broken system. It is just a different system with its own logic. That logic is built into the converter. All you have to do is enter the three numbers you read from your citizenship certificate and copy the result.
Do that before you fill any form. Not during. Not after. Before, when you have time to check it twice, write it down, and share it with anyone else in your household who might need it.
Your date of birth is the most repeated piece of information in your life as a document holder. Get it right once and it stays right forever.
Quick summary: How to convert your Nepali birth date
1. Find your BS birth date on your citizenship: year, month, day
2. If in Devanagari numerals, convert each digit to Arabic using the chart in this guide
3. Open merokalam.com/nepali-date-converter/ and select BS to AD
4. Enter year, select month from dropdown, enter day, click Convert
5. Copy the result and save it permanently
6. Use that exact date on every official document, every time
7. Never re-convert unless you have a specific reason to question the original result
Note: The Merokalam Nepali Date Converter covers BS 1970 (April 1913 AD) to BS 2110. For historical birth dates falling before BS 1970, users will need to consult specialized historical calendar resources or the Nepal National Archives. While all conversion results are strictly mapped against the verified, official Bikram Sambat calendar dataset, we strongly recommend cross-checking your final results against your official documents before submitting any high-stakes visa or passport application.