fix: stop using getRawOffset

Author: wood1986

android/src/main/java/com/reactcommunity/rndatetimepicker/DatePickerModule.java

@@ -67,7 +67,7 @@ public void onDateSet(DatePicker view, int year, int month, int day) {
         WritableMap result = new WritableNativeMap();
         result.putString("action", RNConstants.ACTION_DATE_SET);
         result.putDouble("timestamp", calendar.getTimeInMillis());
-        result.putDouble("utcOffset", calendar.getTimeZone().getRawOffset() / 1000 / 60);
+        result.putDouble("utcOffset", calendar.getTimeZone().getOffset(calendar.getTimeInMillis()) / 1000 / 60);
 
         mPromise.resolve(result);
         mPromiseResolved = true;