CODEWITHSUNDEEP
javaandroidtimezone
asha v
asha v

Reputation: 2109

How to get TimeZone from android mobile?

I want to get the time zone from the Android mobile when clicking a button.

Upvotes: 189

Views: 203924

Answers (13)

Albert Aleksieiev
Albert Aleksieiev

Reputation: 117

I have spent some time to find the right answer. But it seems it works strangely on Android SDK. My device always returns 'UTC' as a timezoneId, and 0 as a timezone offset. But you can try to use headless WebView and fetch the timezone from there by JS. After this, you can save it into SharedPreference(TimeZone.setDefault() also works strangely)

class HeadlessWebViewUtil constructor(context: Context) {
    val webView = WebView(context)
    val jsInterface = MyJavaScriptInterface()

    fun fetch() {
        webView.settings.javaScriptEnabled = true
        webView.addJavascriptInterface(jsInterface, "android")
        webView.loadUrl("javascript:android.onTimezoneFetched(Intl.DateTimeFormat().resolvedOptions().timeZone)")
    }

    inner class MyJavaScriptInterface {
        @JavascriptInterface
        public fun onTimezoneFetched(timezoneId: String) {
            Timber.d("Timezone fetched: $timezoneId")
        }
    }
}

// And fetch
val wv = HeadlessWebViewUtil(this, timeZoneManager)
wv.fetch()

Upvotes: 2

Jigar Joshi
Jigar Joshi

Reputation: 240996

Edit: corrected the case

TimeZone.getDefault()

Upvotes: 22

DummyData
DummyData

Reputation: 682

All the answers here seem to suggest setting the daylight parameter to false. This is incorrect for many time zones which change abbreviated names depending on the time of the year (e.g., EST vs. EDT).

The solution below will give you the correct abbreviation according to the current date for the time zone.

val tz = TimeZone.getDefault()
val isDaylight = tz.inDaylightTime(Date())
val timezone = tz.getDisplayName(isDaylight, TimeZone.SHORT)

Upvotes: 5

Bipi
Bipi

Reputation: 3589

On my device, TimeZone.getDefault() is always returning the UTC time zone.

I need to do this to get the user-configured time zone:

TimeZone.setDefault(null)
val tz = TimeZone.getDefault()

It will return the user-selected time zone.

Upvotes: 6

Anonymous
Anonymous

Reputation: 86399

ZoneId from java.time and ThreeTenABP

Modern answer:

    ZoneId zone = ZoneId.systemDefault();
    System.out.println(zone);

When I ran this snippet in Australia/Sydney time zone, the output was exactly that:

Australia/Sydney

If you want the summer time (DST) aware time zone name or abbreviation:

    DateTimeFormatter longTimeZoneFormatter = DateTimeFormatter.ofPattern("zzzz", Locale.getDefault());
    String longTz = ZonedDateTime.now(zone).format(longTimeZoneFormatter);
    System.out.println(longTz);
    
    DateTimeFormatter shortTimeZoneFormatter = DateTimeFormatter.ofPattern("zzz", Locale.getDefault());
    String shortTz = ZonedDateTime.now(zone).format(shortTimeZoneFormatter);
    System.out.println(shortTz);

Eastern Summer Time (New South Wales)
EST

The TimeZone class used in most of the other answers was what we had when the question was asked in 2011, even though it was poorly designed. Today it’s long outdated, and I recommend that instead we use java.time, the modern Java date and time API that came out in 2014.

Question: Doesn’t java.time require Android API level 26?

java.time works nicely on both older and newer Android devices. It just requires at least Java 6.

  • In Java 8 and later and on newer Android devices (from API level 26) the modern API comes built-in.
  • In non-Android Java 6 and 7 get the ThreeTen Backport, the backport of the modern classes (ThreeTen for JSR 310; see the links at the bottom).
  • Edit: On (older) Android usually, as long as you're on Android Gradle plugin 4.0 or newer, with coreLibraryDesugaring you can use java.time directly. ThreeTenABP is no longer needed. (Previous bullet: use the Android edition of ThreeTen Backport. It’s called ThreeTenABP. And make sure you import the date and time classes from org.threeten.bp with subpackages.)

Links

Upvotes: 15

Sher Ali
Sher Ali

Reputation: 5793

TimeZone tz = TimeZone.getDefault();
System.out.println("TimeZone   "+tz.getDisplayName(false, TimeZone.SHORT)+" Timezone id :: " +tz.getID());

Output:

TimeZone GMT+09:30 Timezone id :: Australia/Darwin

Upvotes: 161

Raja Jawahar
Raja Jawahar

Reputation: 6972

TimeZone timeZone = TimeZone.getDefault(); 
timeZone.getID();

It will print like

Asia/Kolkata

Upvotes: 12

Maciej Beimcik
Maciej Beimcik

Reputation: 3348

For devices with API 26 and higher, you can get it like this:

ZonedDateTime.now().getZone().toString();

Upvotes: 1

Jaydeep purohit
Jaydeep purohit

Reputation: 1566

Simplest Solution With Simple Date Format: SimpleDateFormat("ZZZZZ"):

 Calendar calendar = Calendar.getInstance(TimeZone.getTimeZone("GMT"),
                Locale.getDefault());
        Date currentLocalTime = calendar.getTime();

        DateFormat date = new SimpleDateFormat("ZZZZZ",Locale.getDefault());
        String localTime = date.format(currentLocalTime);
        System.out.println(localTime+ "  TimeZone   " );

==> Output is : +05:30

Upvotes: 3

Adnan Abdollah Zaki
Adnan Abdollah Zaki

Reputation: 4406

I needed the offset that not only included day light savings time but as a numerial. Here is the code that I used in case someone is looking for an example.

I get a response of "3.5" (3:30') which is what I would expect in Tehran , Iran in winter and "4.5" (4:30') for summer .

I also needed it as a string so I could post it to a server so you may not need the last line.

for getting currect time zone :

TimeZone tz = TimeZone.getDefault();
Date now = new Date();
//Import part : x.0 for double number
double offsetFromUtc = tz.getOffset(now.getTime()) / 3600000.0;
String m2tTimeZoneIs = Double.parseDouble(offsetFromUtc);

Upvotes: 17

Thom
Thom

Reputation: 15102

According to http://developer.android.com/reference/android/text/format/Time.html you should be using Time.getCurrentTimezone() to retrieve the current timezone of the device.

Upvotes: 2

Tobias
Tobias

Reputation: 9380

Have you tried to use TimeZone.getDefault():

Most applications will use TimeZone.getDefault() which returns a TimeZone based on the time zone where the program is running.

Ref: http://developer.android.com/reference/java/util/TimeZone.html

Upvotes: 246

anujprashar
anujprashar

Reputation: 6335

Try this code-

Calendar cal = Calendar.getInstance();
TimeZone tz = cal.getTimeZone();

It will return user selected timezone.

Upvotes: 14

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