Java tutorial
//package com.java2s; import java.util.Calendar; import java.util.Date; public class Main { public static int getGapDay(Date startDate, Date endDate) { Calendar fromCalendar = Calendar.getInstance(); fromCalendar.setTime(startDate); fromCalendar.set(Calendar.HOUR_OF_DAY, 0); fromCalendar.set(Calendar.MINUTE, 0); fromCalendar.set(Calendar.SECOND, 0); fromCalendar.set(Calendar.MILLISECOND, 0); Calendar toCalendar = Calendar.getInstance(); toCalendar.setTime(endDate); toCalendar.set(Calendar.HOUR_OF_DAY, 0); toCalendar.set(Calendar.MINUTE, 0); toCalendar.set(Calendar.SECOND, 0); toCalendar.set(Calendar.MILLISECOND, 0); return (int) ((toCalendar.getTime().getTime() - fromCalendar.getTime().getTime()) / (1000 * 60 * 60 * 24)); } }