timezone

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Timezone project providing a simple way to turn location and unix timestamp into timezone and local time.

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timezone
========
![Build Status](https://travis-ci.org/graphhopper/timezone.svg?branch=master)

Requires Java 1.8.

## Timezone Core

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:

```java
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);
```

## Timezone Webapp
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.

### Example

#### Example 1

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

response:

```json
{

"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
    }

}

```

#### Example 2

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

response:

```json
{
    "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
    }
}

```

#### Example 3

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

response:

```json
{
    "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)

### Input & Output

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:

Parameter | Description
:------|:-----
timestamp | Unix timestamp (in seconds)
location | latitude, longitude
language | optional, default is 'en' - see the supported languages [here](http://www.oracle.com/technetwork/java/javase/javase7locales-334809.html)

Output:

Name | Description
:------|:-----
timezone | time zone id as defined here: http://efele.net/maps/tz/world/
timezone_name | full name of time zone
local_time | local time information considering daylight saving time

local_time:

Name | Description
:------|:-----
offset | offset to UTC in seconds
year | -
month | -
day_of_month | -
day_of_week | -
month_value | -
hour | -
minute | -
second | -
nano | -

## TZ data
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"](https://www.timeanddate.com/news/time/russia-abandons-permanent-summer-time.html) 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

timezone

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