my-bikram-sambat-js

A lightweight utility library to convert dates between the Gregorian calendar (AD) and the Nepali Bikram Sambat calendar (BS), written in TypeScript.

Installation

Using NPM:

npm install my-bikram-sambat-js

Using Yarn:

yarn add my-bikram-sambat-js

Usage

Server-side (CommonJS)

const { ADToBS, BSToAD, BikramSambat } = require('my-bikram-sambat-js');

// AD to BS
console.log(ADToBS('2019-08-25')); // Output: "2076-05-08"

// BS to AD
console.log(BSToAD('2076-05-08')); // Output: "2019-08-25"

// Using the BikramSambat class
const bs = new BikramSambat('2019-08-25');
console.log(bs.toBS()); // Output: "2076-05-08"

const ad = new BikramSambat('2076-05-08', 'BS');
console.log(ad.toAD()); // Output: "2019-08-25"

ES6 Modules

import { ADToBS, BSToAD } from 'my-bikram-sambat-js';

console.log(ADToBS("2024-12-31")); // Output: "2081-09-15"
console.log(BSToAD("2081-09-15")); // Output: "2024-12-31"

Or using the class:

import BikramSambat from 'my-bikram-sambat-js';

const bs = new BikramSambat("2024-12-31");
console.log(bs.toBS()); // Output: "2081-09-15"

const ad = new BikramSambat("2081-09-15", "BS");
console.log(ad.toAD()); // Output: "2024-12-31"

API Reference

ADToBS(date)

Converts a Gregorian date (AD) to Nepali date (BS).

Parameters:

• date: string | Date — format: YYYY-MM-DD or JS Date

Returns:

• string — BS date in format YYYY-MM-DD

BSToAD(date)

Converts a Nepali BS date to Gregorian AD.

Parameters:

• date: string — format: YYYY-MM-DD

Returns:

• string — AD date in format YYYY-MM-DD

BikramSambat(date: string, type?: 'AD' | 'BS')

Class for two-way conversion between AD and BS.

Methods:

• toAD() – Converts internal BS date to AD string
• toBS() – Converts internal AD date to BS string

Inspiration

https://github.com/puncoz-official/bikram-sambat-js

License (MIT)

MIT License

Copyright (c) 2025 Spahari

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.