Introduction to geo-tz: The Ultimate Time Zone Library for Geographical Coordinates

geo-tz is an impressive library that allows developers to easily determine the
time zone from geographical coordinates. This is particularly useful for applications that
require accurate time information based on the user’s or any specific location.

With dozens of useful APIs and functionalities, geo-tz makes it a breeze to integrate
time zone calculations into your applications. Let’s explore some of the key APIs provided
by this powerful library.

Key APIs and Code Snippets

1. getTZ

The getTZ API fetches the time zone for a given latitude and longitude.

  const geoTz = require('geo-tz');
  
  // Example
  const timezone = geoTz.find(37.7749, -122.4194);  // San Francisco coordinates
  console.log(timezone);  // Output: ['America/Los_Angeles']

2. getAllTimeZones

The getAllTimeZones API returns all possible time zones currently known.

  const geoTz = require('geo-tz');
  
  // Example
  const allTimeZones = geoTz.getAllTimeZones();
  console.log(allTimeZones);  
  // Output: Array of all time zones

3. isDstObserved

The isDstObserved API checks if daylight saving time (DST) is observed in a particular time zone.

  const geoTz = require('geo-tz');
  
  // Example
  const isDst = geoTz.isDstObserved('America/Los_Angeles');
  console.log(isDst);  // Output: true or false

4. getUtcOffset

The getUtcOffset API retrieves the UTC offset for a specified time zone.

  const geoTz = require('geo-tz');
  
  // Example
  const utcOffset = geoTz.getUtcOffset('America/Los_Angeles');
  console.log(utcOffset);  // Output: '-07:00' or '-08:00'

Practical Application Example

Below is a simple application example that uses some of the introduced APIs to display
the current local time for a given set of geographical coordinates.

  const geoTz = require('geo-tz');
  const moment = require('moment-timezone');
  
  // Function to display current local time for given coordinates
  function displayLocalTime(lat, lon) {
    const timeZones = geoTz.find(lat, lon);
    const currentTime = moment.tz(timeZones[0]).format('YYYY-MM-DD HH:mm:ss');
    console.log(`Current local time at (${lat}, ${lon}): ${currentTime}`);
  }
  
  // Example usage
  displayLocalTime(40.712776, -74.005974);  // New York City coordinates
  // Output: Current local time at (40.712776, -74.005974): [local time]

With geo-tz, integrating time zone functionalities in your applications has never been easier.

To get started, install geo-tz via npm:

  npm install geo-tz

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