Here you can find the source of convertDateToHour(Date d)
public static String convertDateToHour(Date d)
//package com.java2s; //License from project: Apache License import java.text.DateFormatSymbols; import java.text.SimpleDateFormat; import java.util.*; public class Main { public static String convertDateToHour(Date d) { SimpleDateFormat df = new SimpleDateFormat("HH", new DateFormatSymbols()); return df.format(d); }/*from w ww .j a v a 2 s . c o m*/ /** * Returns a string the represents the passed-in date parsed according to * the passed-in format. Returns an empty string if the date or the format * is null. **/ public static String format(Date aDate, SimpleDateFormat aFormat) { if (aDate == null || aFormat == null) { return ""; } synchronized (aFormat) { return aFormat.format(aDate); } } }