Determine timezone from lat/long in NodeJS
I am no longer actively working on this project and review PRs about once every three or four months. If you believe you'd be a good maintainer of this project, please get in touch.
npm install tzwhere
var tzwhere = require('tzwhere')
tzwhere.init();
var whiteHouse = {'lat': 38.897663, 'lng': -77.036562};
// Determine the timezone of the White House
console.log(tzwhere.tzNameAt(whiteHouse['lat'], whiteHouse['lng']));
// Determine the current offset from UTC, in milliseconds, of the White House's timezone
console.log(tzwhere.tzOffsetAt(whiteHouse['lat'], whiteHouse['lng']));
yields:
America/New_York
-14400000
or
America/New_York
-18000000
depending on the current state of daylight savings time in the America/New_York timezone. You can also do it asynchronously.
...
tzwhere.tzNameAt(whiteHouse['lat'], whiteHouse['lng'], function (error, result) {
if (error) {
console.log(error);
} else {
console.log(result);
}
}
...
You can also pass alternative GeoJSON shape files:
var tzwhere = require('tzwhere')
tzwhere.init('path/to/alternative/tz/file');
...
Check the tests for more comprehensive usage, including determining the timezone offsets at arbitrary dates (very useful for scheduling future events expressed in local time).
tzwhere is free software, and is distributed under the terms of the MIT license (see LICENSE.txt).