Java tutorial
//package com.java2s; import java.util.Calendar; public class Main { public static Calendar getCalendarAtMidnight(int relativeDayToToday) { Calendar calendar = Calendar.getInstance(); calendar.set(Calendar.HOUR_OF_DAY, 0); calendar.set(Calendar.MINUTE, 0); calendar.set(Calendar.SECOND, 0); calendar.add(Calendar.DAY_OF_YEAR, relativeDayToToday); return calendar; } }