Requires Java 1.8.

The timezone project can be imported into your project and run by directly interfacing with the public methods, without needing to start the web service. Add the project as a dependency and create a new TimeZones object, which can be interacted with through .getTimeZone() and .getOffsetDateTime() including all local time and timezone information such as current time in the timezone and offset from GMT.

Example:

TimeZones timeZones = new TimeZones();
timeZones.initWithWorldData(new File("./world-data/tz_world.shp").toURI().toURL());

TimeZone tz = timeZones.getTimeZone(40.713956,-75.767577);
long unixTimeStamp = 1488363179;
OffsetDateTime offsetDateTime = timeZones.getOffsetDateTime(unixTimeStamp,tz);
System.out.println(offsetDateTime);

//or even shorter
OffsetDateTime offsetDateTime2 = timeZones.getOffsetDateTime(unixTimeStamp,40.713956,-75.767577);
System.out.println(offsetDateTime2);

Our timezone app turns your location and timestamp into timezone and local time. Thus, if you need local time in your application, just ask GraphHopper timezone. It is microservice you can run wherever you like.

request: http://localhost:8080/timezone?timestamp=1488363179&location=40.713956,-75.767577

response:

{

    "timezone": "America/New_York",
    "timezone_name": "Eastern Standard Time",
    "local_time": {
        "offset": -18000,
        "year": 2017,
        "month": "March",
        "day_of_month": 2,
        "day_of_week": "Thursday",
        "month_value": 3,
        "hour": 16,
        "minute": 19,
        "second": 52,
        "nano": 0
    }

}

request: http://localhost:8080/timezone?timestamp=1488489592&location=48.873748,2.344482&language=fr

response:

{
    "timezone": "Europe/Paris",
    "timezone_name": "Heure d'Europe centrale",
    "local_time": {
        "offset": 3600,
        "year": 2017,
        "month": "mars",
        "day_of_month": 2,
        "day_of_week": "jeudi",
        "month_value": 3,
        "hour": 22,
        "minute": 19,
        "second": 52,
        "nano": 0
    }
}

request: http://localhost:8080/timezone?timestamp=1488489592&location=36.031332,138.796876&language=ja

response:

{
    "timezone": "Asia/Tokyo",
    "timezone_name": "日本標準時",
    "local_time": {
        "offset": 32400,
        "year": 2017,
        "month": "3月",
        "day_of_month": 3,
        "day_of_week": "金曜日",
        "month_value": 3,
        "hour": 6,
        "minute": 19,
        "second": 52,
        "nano": 0
    }
}

try your own example:

• get current unix timestamp from here: http://www.unixtimestamp.com/
• and coordinates from here: https://graphhopper.com/maps/ (just right click wherever you like to specify start and you will be provided with the coordinates in the start field. just copy and paste it as it is)

You need to specify two parameters, (Unix) timestamp and location (lat,lon), and you will be provided with the according timezone, local time and offset to UTC. Local time and offset consider daylight saving time (dst).

Input:

Output:

local_time:

Make sure that you have updated your java environment with the latest tz data, otherwise old DST data might yield wrong local times. For example, such events "Russia Returns to Standard Time All Year" cause wrong local time calculations if you have not updated your JRE/JDK. You can update it as described here:

http://www.oracle.com/technetwork/java/javase/tzupdater-readme-136440.html