converting date time to 24 hour format

Solution 1:

H vs h is difference between 24 hour vs 12 hour format.

Solution 2:

Try this:

String dateStr = "Jul 27, 2011 8:35:29 AM";
DateFormat readFormat = new SimpleDateFormat( "MMM dd, yyyy hh:mm:ss aa");
DateFormat writeFormat = new SimpleDateFormat( "yyyy-MM-dd HH:mm:ss");
Date date = null;
try {
    date = readFormat.parse(dateStr);
} catch (ParseException e) {
    e.printStackTrace();
}

if (date != null) {
    String formattedDate = writeFormat.format(date);
}

Solution 3:

kk = Hours in 1-24 format
hh= hours in 1-12 format
KK= hours in 0-11 format
HH= hours in 0-23 format