Here you can find the source of getLastDayOfQuarter(Date date)
public static Date getLastDayOfQuarter(Date date)
//package com.java2s; import java.text.ParseException; import java.util.Calendar; import java.util.Date; public class Main { public static Date getLastDayOfQuarter(Date date) { Calendar calendar = Calendar.getInstance(); calendar.setTime(date);// w w w . java2s. c om return getLastDayOfQuarter(calendar.get(Calendar.YEAR), getQuarterOfYear(date)); } public static Date getLastDayOfQuarter(Integer year, Integer quarter) { Calendar calendar = Calendar.getInstance(); Integer month = new Integer(0); if (quarter == 1) { month = 3 - 1; } else if (quarter == 2) { month = 6 - 1; } else if (quarter == 3) { month = 9 - 1; } else if (quarter == 4) { month = 12 - 1; } else { month = calendar.get(Calendar.MONTH); } return getLastDayOfMonth(year, month); } public static int getQuarterOfYear(Date date) { Calendar calendar = Calendar.getInstance(); calendar.setTime(date); return calendar.get(Calendar.MONTH) / 3 + 1; } public static Date getLastDayOfMonth(Date date) throws ParseException { Calendar calendar = Calendar.getInstance(); calendar.setTime(date); calendar.set(calendar.get(Calendar.YEAR), calendar.get(Calendar.MONTH), 1); calendar.roll(Calendar.DATE, -1); return calendar.getTime(); } public static Date getLastDayOfMonth(Integer year, Integer month) { Calendar calendar = Calendar.getInstance(); if (year == null) { year = calendar.get(Calendar.YEAR); } if (month == null) { month = calendar.get(Calendar.MONTH); } calendar.set(year, month, 1); calendar.roll(Calendar.DATE, -1); return calendar.getTime(); } }