Date Util

DateUtil.java

public class DateUtil {

	public static Date newDate(int year, int month, int day) {
		return newDate(year, month, day, 0, 0, 0);
	}

	public static Date newDate(int year, int month, int day, int hourOfDay, int minute, int second) {
		Calendar calendar = newCalendar(new Date());
		calendar.set(Calendar.YEAR, year);
		calendar.set(Calendar.MONTH, month);
		calendar.set(Calendar.DAY_OF_MONTH, day);
		calendar.set(Calendar.HOUR_OF_DAY, hourOfDay);
		calendar.set(Calendar.MINUTE, minute);
		calendar.set(Calendar.SECOND, second);
		calendar.clear(Calendar.MILLISECOND);

		return calendar.getTime();
	}

	public static Date withTime(Date date, int hourOfDay, int minute, int second) {
		Calendar calendar = newCalendar(date);
		calendar.set(Calendar.HOUR_OF_DAY, hourOfDay);
		calendar.set(Calendar.MINUTE, minute);
		calendar.set(Calendar.SECOND, second);
		return calendar.getTime();
	}

	public static int getYear(Date date) {
		return newCalendar(date).get(Calendar.YEAR);
	}

	public static int getMonth(Date date) {
		return newCalendar(date).get(Calendar.MONTH);
	}

	public static int getDay(Date date) {
		return newCalendar(date).get(Calendar.DAY_OF_MONTH);
	}

	public static int getHour(Date date) {
		return newCalendar(date).get(Calendar.HOUR_OF_DAY);
	}

	public static int getMinute(Date date) {
		return newCalendar(date).get(Calendar.MINUTE);
	}

	public static Date addMonths(int months, Date date) {
		Calendar calendar = newCalendar(date);
		calendar.add(Calendar.MONTH, months);
		return calendar.getTime();
	}

	public static Date addMonthsToNow(int months) {
		return addMonths(months, new Date());
	}

	public static Date addDaysToNow(int days) {
		return addDays(days, new Date());
	}

	public static Date addDays(int days, Date date) {
		Calendar calendar = newCalendar(date);
		calendar.add(Calendar.DAY_OF_MONTH, days);
		return calendar.getTime();
	}

	public static Date addYears(int years, Date date) {
		Calendar calendar = newCalendar(date);
		calendar.add(Calendar.YEAR, years);
		return calendar.getTime();
	}

	public static Date addMinutes(int minutes, Date date) {
		Calendar calendar = newCalendar(date);
		calendar.add(Calendar.MINUTE, minutes);
		return calendar.getTime();
	}

	public static Date addMinutesToNow(int minutes) {
		return addMinutes(minutes, new Date());
	}

	public static Date addSeconds(int seconds, Date date) {
		Calendar calendar = newCalendar(date);
		calendar.add(Calendar.SECOND, seconds);
		return calendar.getTime();
	}

	public static Date addYearsToNow(int years) {
		return addYears(years, new Date());
	}

	public static Date today() {
		return new Date();
	}

	public static Date today(int hour, int minute) {
		return withTime(today(), hour, minute, 0);
	}

	public static Date yesterday() {
		return addDaysToNow(-1);
	}

	public static Date minAgo() {
		return addMinutesToNow(-1);
	}

	public static Date tomorrow() {
		return addDaysToNow(1);
	}

	public static Date tomorrow(int hour, int minute) {
		return withTime(tomorrow(), hour, minute, 0);
	}

	public static Date nextWeek() {
		return addDaysToNow(7);
	}

	public static Date weekAgo() {
		return addDaysToNow(-7);
	}

	public static int get(int field, Date date) {
		Calendar calendar = newCalendar(date);
		return calendar.get(field);
	}

	private static Calendar newCalendar(Date date) {
		Calendar calendar = new GregorianCalendar();
		calendar.setTime(date);
		return calendar;
	}

	public static boolean isFirstDayOfMonth() {
		Calendar calendar = newCalendar(new Date());
		return calendar.get(Calendar.DAY_OF_MONTH) == 1;
	}

	public static boolean isLastDayOfMonth() {
		Calendar calendar = newCalendar(new Date());
		int lastDay = calendar.getActualMaximum(Calendar.DAY_OF_MONTH);
		return calendar.get(Calendar.DAY_OF_MONTH) == lastDay;
	}

}