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I wanted to change timezone in android programmatically like to set timezone as "America/Los_Angeles". How can I do this. How can this be possible by using id's.
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Call TimeZone. getAvailableIDs() to get the list of known timezones for your system. This permission is only allowed for system apps. on android api 26 and 27 receive this error: setTimeZone: Neither user 10087 nor current process has android.
On a current Android device, tap the Clock app, tap the Globe icon (bottom of the screen), then search for UTC and tap the UTC result. On a current iOS device, tap the Clock app, tap World Clock, then + (in the upper-right corner), search for UTC, then tap the UTC result.
Typically, you get a TimeZone using getDefault which creates a TimeZone based on the time zone where the program is running. For example, for a program running in Japan, getDefault creates a TimeZone object based on Japanese Standard Time. Hours must be between 0 to 23 and Minutes must be between 00 to 59.
#Step 2: Set timezone in Intellij Under VM options, type the timezone you want. Example: -Duser. timezone="UTC" if you want UTC.
In your AndroidManifest.xml
<uses-permission android:name="android.permission.SET_TIME_ZONE"/>
In your source:
AlarmManager am = (AlarmManager) getContext().getSystemService(Context.ALARM_SERVICE);
am.setTimeZone("America/Los_Angeles");
If this is on a simulator or a device that you have root on, you could run
adb shell "su -c 'setprop persist.sys.timezone America/Los_Angeles; stop; sleep 5; start'"
Abhishek's code simply defines a Calendar instance with a specific format to be used in the app, so that will not work.
It is not possible to change the phone's timezone programmatically. You could redirect the user to the appropriate settings, however:
startActivity(new Intent(android.provider.Settings.ACTION_DATE_SETTINGS));
Calendar calendar = Calendar.getInstance();
SimpleDateFormat sdf = new SimpleDateFormat("dd-MMM-yyyy hh:mm:ss z");
sdf.setTimeZone(TimeZone.getTimeZone("America/Los_Angeles"));
System.out.println(sdf.format(calendar.getTime()));
Source
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