package com.javabrahman.java8.time;
import java.time.DayOfWeek;
import java.time.LocalDate;
import java.time.YearMonth;
import java.time.temporal.ChronoField;
import java.time.temporal.TemporalAdjusters;
public class LastDayOfMonth {
 public static void main(String args[]) {
  //1A. Last day of current month
  LocalDate lastDayofCurrentMonth = LocalDate.now().with(TemporalAdjusters.lastDayOfMonth());
  System.out.println("1A. Last day of the current month: "+
      lastDayofCurrentMonth.getDayOfWeek() + "," + lastDayofCurrentMonth);

  //1B. Last working day(LWD) of current month reusing lastDayOfCurrentMonth
  LocalDate lastWorkDayCurrentMonth=getLastWorkingDayOfMonth(lastDayofCurrentMonth);
  System.out.println("1B. Last working day of current month: "+
      lastWorkDayCurrentMonth.getDayOfWeek() + "," + lastWorkDayCurrentMonth);

  //2A. Last day of month for given date-"2017-01-13"
  LocalDate lastDayofMonthGivenDate = LocalDate.of(2017,01,13).with(TemporalAdjusters.lastDayOfMonth());
  System.out.println("2A. Last day of month for '2017-01-13': "+
      lastDayofMonthGivenDate.getDayOfWeek() + "," + lastDayofMonthGivenDate);

  //2B. LWD of month for date-"2017-01-13" reusing lastDayofMonthGivenDate
  LocalDate lastWorkDayGivenDate=getLastWorkingDayOfMonth(lastDayofMonthGivenDate);
  System.out.println("2B. Last working day of month for '2017-01-13': "+
    lastWorkDayGivenDate.getDayOfWeek() + "," + lastWorkDayGivenDate);

  //3A. Last day of month for year-month combination-"Apr, 2017"
  LocalDate lastDayofMonthYear = YearMonth.of(2017,04).atEndOfMonth();
  System.out.println("3A. Last day of month for 'Apr, 2017': "+
    lastDayofMonthYear.getDayOfWeek() + "," + lastDayofMonthYear);

  //3B. LWD of month for year-month combination-"Apr, 2017" reusing lastDayofMonthYear
    LocalDate lastWorkDayMonthYear=getLastWorkingDayOfMonth(lastDayofMonthYear);
    System.out.println("3B. Last working day of month for 'Apr, 2017': "+
      lastWorkDayMonthYear.getDayOfWeek() + "," + lastWorkDayMonthYear);
 }

 /**
  * Method calculates last working day for last day of month as input
  * @param lastDayOfMonth
  * @return LocalDate instance containing last working day
  */
 public static LocalDate getLastWorkingDayOfMonth(LocalDate lastDayOfMonth) {
   LocalDate lastWorkingDayofMonth;
   switch (DayOfWeek.of(lastDayOfMonth.get(ChronoField.DAY_OF_WEEK))) {
     case SATURDAY:
       lastWorkingDayofMonth = lastDayOfMonth.minusDays(1);
       break;
     case SUNDAY:
       lastWorkingDayofMonth = lastDayOfMonth.minusDays(2);
       break;
     default:
       lastWorkingDayofMonth = lastDayOfMonth;
   }
   return lastWorkingDayofMonth;
 }
}