Question

I have a requirement in project
to Convert 24 hours format to 12 hours format
for example
if it is 17:12:01 it should be converted to 05:12:01

Answer 1

You can use a SimpleDateFormat http://download.oracle.com/javase/6/docs/api/java/text/SimpleDateFormat.html to format it.

Date date = new Date(yourdate);
// format however you see fit
SimpleDateFormat format = new SimpleDateFormat("hh:mm:ss");
String formatted = format.format(date);

As suggested by Software Monkey, also use a SimpleDateFormat to parse your 24hr date if you don’t already have it in millis.