Here you can find the source of getTime(Date date, int CalendarType, int interval)
public static Date getTime(Date date, int CalendarType, int interval)
//package com.java2s; import java.util.Calendar; import java.util.Date; public class Main { public static Date getTime(Date date, int CalendarType, int interval) { Calendar c = Calendar.getInstance(); c.setTime(date);/*w w w . j a va2s .c om*/ c.add(CalendarType, interval); return c.getTime(); } }