how to validate date and time format in java

i want validate this date formate YYYY-MM-DDThh:mm:ss

i have the code to validate YYYY-MM-DD but i want validate
this formate YYYY-MM-DDThh:mm:ss

please help me on this issue.

here is the code to validate YYYY-MM-DD format

private boolean validateDateFormate(String date)

{

try

{

String dateFormat="yyyy-MM-dd";

String temp = date.substring(0,date.indexOf("-"));

if(temp.length()!= 4)

return false;

SimpleDateFormat df=new SimpleDateFormat(dateFormat);

Date date1=df.parse(date);

String resultDateString=df.format(date1);

if ( !date.equals(resultDateString))
return false;

}

catch (Exception de)

{
return false;
}

return true;

}