Here you can find the source of getLastDayOfMonth(String year, String month)
Parameter | Description |
---|---|
year | a parameter |
month | a parameter |
public static String getLastDayOfMonth(String year, String month)
//package com.java2s; /**/*from w ww. j ava 2 s . c o m*/ * Copyright 2012 NCS Pte. Ltd. All Rights Reserved * * This software is confidential and proprietary to NCS Pte. Ltd. You shall * use this software only in accordance with the terms of the license * agreement you entered into with NCS. No aspect or part or all of this * software may be reproduced, modified or disclosed without full and * direct written authorisation from NCS. * * NCS SUPPLIES THIS SOFTWARE ON AN "AS IS" BASIS. NCS MAKES NO * REPRESENTATIONS OR WARRANTIES, EITHER EXPRESSLY OR IMPLIEDLY, ABOUT THE * SUITABILITY OR NON-INFRINGEMENT OF THE SOFTWARE. NCS SHALL NOT BE LIABLE * FOR ANY LOSSES OR DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, * MODIFYING OR DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. */ import java.util.Calendar; import java.util.Date; public class Main { /** * get last day of month * @param year * @param month * @return */ public static String getLastDayOfMonth(String year, String month) { Calendar cal = Calendar.getInstance(); cal.set(Calendar.YEAR, Integer.parseInt(year)); cal.set(Calendar.MONTH, Integer.parseInt(month) - 1); cal.set(Calendar.DATE, 1); cal.add(Calendar.MONTH, 1); cal.add(Calendar.DATE, -1); return String.valueOf(cal.get(Calendar.DAY_OF_MONTH)); } /** * Date Arithmetic function. Adds the specified (signed) amount of time to * the given time field, based on the calendar's rules. * <p> * For example, to subtract 5 days from a specific date, it can be achieved * by calling: <p> * DateUtil.add(date, Calendar.DATE, -5). * <p> * @param date The date to perform the arithmetic function on * @param field A Calendar constant to retrieve the field value from the Date * object. Same as for {@link #get get()}. * @param amount the amount of date or time to be added to the field * @return The date as a result of the execution of the arithmetic function. */ public static Date add(Date date, int field, int amount) { Calendar cal = Calendar.getInstance(); cal.setTime(date); cal.add(field, amount); return cal.getTime(); } /** * Retrieves the value of the field in the Date. * Some common fields that is likely to be used include : * <p> * <li>Calendar.YEAR - retrieves the year value * <li>Calendar.MONTH - retrieves the month value ( 1 - 12 ) * <li>Calendar.DAY_OF_MONTH - retrieve the day value ( 1 - 31 ) * <li>Calendar.HOUR - retrieves the hours value in 12 hour format ( 1 - 12 ) * <li>Calendar.HOUR_OF_DAY - retrieves the hours value in 24 hour format ( 0 - 23 ) * <li>Calendar.MINUTE - retrieves the minutes value ( 0 - 59 ) * <li>Calendar.AM_PM - retrieves the am/pm value ( 0 = am; 1 = pm ) * <p> * @param date The Date object to extract value from. * @param field A Calendar constant to retrieve the field value from the Date * object. * @return The value of the field that is requested. * @throws ArrayIndexOutOfBoundsException - if specified field is out of * range (<code>field</code> < 0 || <code>field</code> >= <code>Calendar.FIELD_COUNT</code>). * @see java.util.Calendar */ public static int get(Date date, int field) { Calendar cal = Calendar.getInstance(); cal.setTime(date); int value = cal.get(field); // Add 1 if the field is Calendar.MONTH since Calendar returns // the month value starting from 0. if (Calendar.MONTH == field) value += 1; // If it is 12 am/pm, the value will be 0. Need to change it to 12 for ease of display. if (Calendar.HOUR == field && value == 0) value = 12; return value; } }