How to convert time as per Timezone selection in android?

Question

My Application downloading shopping details.
Example : Shopping details downloaded at 5 :30 London time.
Now, change any other timezone, so convert downloaded time s per the selected timezone.
Timezone is changing from settings under Date/time. How to programmatically achieve this ? so how to convert the downloaded time as per the timezone selection ?

Answer 1

Try this,

I assume you have downloaded the shopping details at 12:00 PM London time. I am using HH assuming that you are using 24hr format. If you want to convert that to device default time zone, set the timezone using DateFormat & format the existing time.

TimeZone.getDefault() which gives the device default timezone.

 try {
       DateFormat utcFormat = new SimpleDateFormat("HH:mm");
       utcFormat.setTimeZone(TimeZone.getTimeZone("GMT"));

       Date date = utcFormat.parse("12:00");

       DateFormat deviceFormat = new SimpleDateFormat("HH:mm");
       deviceFormat.setTimeZone(TimeZone.getDefault()); //Device timezone

       String convertedTime = deviceFormat.format(date);

} catch(Exception e){

}