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Node.js implementation

Home Page: https://kollavarsham.org/javascript.html

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kollavarsham-nodejs's Introduction

kollavarsham

Convert Gregorian date to Kollavarsham date and vice versa

UPDATE (9/16/2015): This ES5 version of the library has been ported into an ES2015/ES6 version that is transcompiled by Babel at https://github.com/kollavarsham/kollavarsham-js. The core npm package will be published from that repo from here onwards.

Getting Started

Install the module with: npm install kollavarsham

Usage

var Kollavarsham = require('kollavarsham');

var options = {
  system: 'SuryaSiddhanta',
  latitude: 10,
  longitude: 76.2,
  outputFormat: 'verbose'
};

var kollavarsham = new Kollavarsham(options);

var todayInMalayalamEra = kollavarsham.fromGregorianDate(new Date());

var today = kollavarsham.toGregorianDate(todayInMalayalamEra);

Documentation

Click here to visit the API Documentation

CLI app

Check out the cli module (GitHub repo) for the kollavarsham cross-platform CLI app

npm install -g kollavarsham-cli

kollavarsham --help

Contributing

Check the Contributing guide.

Release History

Check out the history at GitHub Releases

License

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kollavarsham-nodejs's Issues

Error in calculating Malayalam Year from Saka Year

This gist is the Malyalam calendar for 2015, which is the response from http://calendar.kollavarsham.org/api/years/2015 (with Accept: plain/text header)

And as can be seen there, for the few days in March and April (starting from this line) the Malayalam year jumps one incorrectly.

This seems to be because 2015-March-21 is the beginning of a new year in the Saka Calendar and the saura masa (or malayalam month) has still not crossed into the next month to make the current version of the equation to calculate the Malyalam Year work:

Offending lines at lines 110 and 111 in lib/calculations.js:

    var malayalamYear = globals.YearSaka - 747 +
      math.truncate((sauraMasaNum - globals.malayalaMasaNum + 12) / 12);

Unable to run kollavarsham after installing globally

I get the following error message:
Aruns-MacBook-Pro:~ arun$ kollavarsham --help
env: node\r: Not a directory

A bit of googling landed me at the below link which looks similar.
yeoman/yeoman#1236

Difference in the definition of "First Day of the Month"?

The difference in the definition of the first day of the month (mentioned in passing on p.14 - p.15 in this paper - see screenshot below for the excerpt) is causing the discrepancy (as compared to the Saka solar month and day) in the Kollavarsham dates of some months.

Consider this example:
kollavarsham -b 16:02:2014 yields this:

Output
------
Saka : 1935 02 Magha      (10)  [Krsnapaksa]
Saura: 1935 04 Kumbha     (10)  P-phalguni
ME   : 1189 04 Kumbham    (06)  Pooram

And this seems to match with the Deepika calendar for 2014

But this command's output does not match the day alone with the calendar:
kollavarsham -b 16:03:2014

Output
------
Saka : 1935 15 Phalguna   (11)  [Suklapaksa]
Saura: 1935 03 Mina       (11)  P-phalguni
ME   : 1189 03 Meenam     (07)  Pooram

@arunkutty Thoughts?