Java tutorial
//package com.java2s; import java.util.Date; public class Main { public static float getHourDiff(long date1, long date2) { return (float) ((date2 - date1) / 3600000.0); } public static float getHourDiff(Date date1, Date date2) { return getHourDiff(date1.getTime(), date2.getTime()); } public static float getHourDiff(Date date) { return getHourDiff(date, new Date()); } public static float getHourDiff(long date) { return getHourDiff(date, new Date().getTime()); } }