How to convert UTC timestamp to device local time in android

Java:

int offset = TimeZone.getDefault().getRawOffset() + TimeZone.getDefault().getDSTSavings();
long now = System.currentTimeMillis() - offset;

Kotlin:

val offset: Int = TimeZone.getDefault().rawOffset + TimeZone.getDefault().dstSavings
val now: Long = System.currentTimeMillis() - offset

Converting a date String of the format "2011-06-23T15:11:32" to our time zone.

private String getDate(String ourDate)
{
    try
    {
        SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        formatter.setTimeZone(TimeZone.getTimeZone("UTC"));
        Date value = formatter.parse(ourDate);

        SimpleDateFormat dateFormatter = new SimpleDateFormat("MM-dd-yyyy HH:mm"); //this format changeable
        dateFormatter.setTimeZone(TimeZone.getDefault());
        ourDate = dateFormatter.format(value);

        //Log.d("ourDate", ourDate);
    }
    catch (Exception e)
    {
        ourDate = "00-00-0000 00:00";
    }
  return ourDate;
}