java处理年、月、周次以及起至日期大全
/*
?* 创建日期 2007-03-14
?*
?* 功能? 取日期时间工具
?*
?*/
package com.util;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Calendar;
import java.util.GregorianCalendar;
/**
* 说明:????? 取日期时间工具
*
* @author?? 好学蜘蛛
* @author?? haoxueweb@163.com
* @version? 1.0
* Company?? http://freehost04.websamba.com/dudu178
*/
public class DateUtil {
?public DateUtil(){}
?/**
???? * @see???? 取得当前日期（格式为：yyyy-MM-dd）
???? * @return?String
???? */
??? public String GetDate()
??? {
??????? SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
??????? String sDate = sdf.format(new Date());
??????? return sDate;
??? }
??? /**
???? * @see???? 取得当前时间（格式为：yyy-MM-dd HH:mm:ss）
???? * @return?String
???? */
??? public static String GetDateTime()
??? {
??????? SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
??????? String sDate = sdf.format(new Date());
??????? return sDate;
??? }
??? /**
???? * @see???? 按指定格式取得当前时间()
???? * @return?String
???? */
??? public String GetTimeFormat(String strFormat)
??? {
??????? SimpleDateFormat sdf = new SimpleDateFormat(strFormat);
??????? String sDate = sdf.format(new Date());
??????? return sDate;
??? }
??? /**
???? * @see???? 取得指定时间的给定格式()
???? * @return?String
???? * @throws ParseException
???? */
??? public String SetDateFormat(String myDate,String strFormat) throws ParseException
??? {
??????? SimpleDateFormat sdf = new SimpleDateFormat(strFormat);
??????? String sDate = sdf.format(sdf.parse(myDate));
??????? return sDate;
??? }
??? public String FormatDateTime(String strDateTime, String strFormat)
??? {
??????? String sDateTime = strDateTime;
??????? try {
??????????? Calendar Cal = parseDateTime(strDateTime);
??????????? SimpleDateFormat sdf = null;
??????????? sdf = new SimpleDateFormat(strFormat);
??????????? sDateTime = sdf.format(Cal.getTime());
??????? } catch (Exception e) {
??????? }
??????? return sDateTime;
??? }
??? public static Calendar parseDateTime(String baseDate)
??? {
??????? Calendar cal = null;
??????? cal = new GregorianCalendar();
??????? int yy = Integer.parseInt(baseDate.substring(0, 4));
??????? int mm = Integer.parseInt(baseDate.substring(5, 7)) - 1;
??????? int dd = Integer.parseInt(baseDate.substring(8, 10));
??????? int hh = 0;
??????? int mi = 0;
??????? int ss = 0;
??????? if(baseDate.length() > 12)
??????? {
??????????? hh = Integer.parseInt(baseDate.substring(11, 13));
??????????? mi = Integer.parseInt(baseDate.substring(14, 16));
??????????? ss = Integer.parseInt(baseDate.substring(17, 19));
??????? }
??????? cal.set(yy, mm, dd, hh, mi, ss);
??????? return cal;
??? }
??? public int getDay(String strDate)
??? {
??????? Calendar cal = parseDateTime(strDate);
??????? return? cal.get(Calendar.DATE);
??? }
??? public int getMonth(String strDate)
??? {
??????? Calendar cal = parseDateTime(strDate);
??????? return cal.get(Calendar.MONTH) + 1;
??? }
??? public int getWeekDay(String strDate)
??? {
??????? Calendar cal = parseDateTime(strDate);
??????? return cal.get(Calendar.DAY_OF_WEEK);
??? }
??? public String getWeekDayName(String strDate)
??? {
??????? String mName[] = {
??????????? "日", "一", "二", "三", "四", "五", "六"
??????? };
??????? int iWeek = getWeekDay(strDate);
??????? iWeek = iWeek - 1;
??????? return "星期" + mName[iWeek];
??? }
??? public int getYear(String strDate)
??? {
??????? Calendar cal = parseDateTime(strDate);
??????? return cal.get(Calendar.YEAR) + 1900;
??? }
??? public String DateAdd(String strDate, int iCount, int iType)
??? {
??????? Calendar Cal = parseDateTime(strDate);
??????? int pType = 0;
??????? if(iType == 0)
??????? {
??????????? pType = 1;
??????? } else
??????? if(iType == 1)
??????? {
??????????? pType = 2;
??????? } else
??????? if(iType == 2)
??????? {
??????????? pType = 5;
??????? } else
??????? if(iType == 3)
??????? {
??????????? pType = 10;
??????? } else
??????? if(iType == 4)
??????? {
??????????? pType = 12;
??????? } else
??????? if(iType == 5)
??????? {
??????????? pType = 13;
??????? }
??????? Cal.add(pType, iCount);
??????? SimpleDateFormat sdf = null;
??????? if(iType <= 2)
??????????? sdf = new SimpleDateFormat("yyyy-MM-dd");
??????? else
??????????? sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
??????? String sDate = sdf.format(Cal.getTime());
??????? return sDate;
??? }
??? public String DateAdd(String strOption, int iDays, String strStartDate)
??? {
??????? if(!strOption.equals("d"));
??????? return strStartDate;
??? }
??? public int DateDiff(String strDateBegin, String strDateEnd, int iType)
??? {
??????? Calendar calBegin = parseDateTime(strDateBegin);
??????? Calendar calEnd = parseDateTime(strDateEnd);
??????? long lBegin = calBegin.getTimeInMillis();
??????? long lEnd = calEnd.getTimeInMillis();
??????? int ss = (int)((lBegin - lEnd) / 1000L);
??????? int min = ss / 60;
??????? int hour = min / 60;
??????? int day = hour / 24;
??????? if(iType == 0)
??????????? return hour;
??????? if(iType == 1)
??????????? return min;
??????? if(iType == 2)
??????????? return day;
??????? else
??????????? return -1;
??? }
???
??? /*****************************************
???? * @功能???? 判断某年是否为闰年
???? * @return? boolean
???? * @throws ParseException
???? ****************************************/
??? public boolean isLeapYear(int yearNum){
??? ?boolean isLeep = false;
??????? /**判断是否为闰年，赋值给一标识符flag*/
??????? if((yearNum % 4 == 0) && (yearNum % 100 != 0)){
??????? ?isLeep = true;
??????? }? else if(yearNum % 400 ==0){
??????? ?isLeep = true;
??????? } else {
??????? ?isLeep = false;
??????? }
??????? return isLeep;
??? }
???
???? /*****************************************
???? * @功能???? 计算当前日期某年的第几周
???? * @return? interger
???? * @throws ParseException
???? ****************************************/
??? public int getWeekNumOfYear(){
??? ?Calendar calendar = Calendar.getInstance();
??? ?int iWeekNum = calendar.get(Calendar.WEEK_OF_YEAR);
??? ?return iWeekNum;
??? }
??? /*****************************************
???? * @功能???? 计算指定日期某年的第几周
???? * @return? interger
???? * @throws ParseException
???? ****************************************/
??? public int getWeekNumOfYearDay(String strDate ) throws ParseException{
??? ?Calendar calendar = Calendar.getInstance();
??? ?SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
??? ?Date curDate = format.parse(strDate);
??? ?calendar.setTime(curDate);
??? ?int iWeekNum = calendar.get(Calendar.WEEK_OF_YEAR);
??? ?return iWeekNum;
??? }
??? /*****************************************
???? * @功能???? 计算某年某周的开始日期
???? * @return? interger
???? * @throws ParseException
???? ****************************************/
??? public String getYearWeekFirstDay(int yearNum,int weekNum) throws ParseException {
??? ?
??? ?Calendar cal = Calendar.getInstance();
??? ?cal.set(Calendar.YEAR, yearNum);
??? ?cal.set(Calendar.WEEK_OF_YEAR, weekNum);
??? ?cal.set(Calendar.DAY_OF_WEEK, Calendar.MONDAY);
??? ?//分别取得当前日期的年、月、日
??? ?String tempYear = Integer.toString(yearNum);
??? ?String tempMonth = Integer.toString(cal.get(Calendar.MONTH) + 1);
??? ?String tempDay = Integer.toString(cal.get(Calendar.DATE));
??? ?String tempDate = tempYear + "-" +tempMonth + "-" + tempDay;
??? ?return SetDateFormat(tempDate,"yyyy-MM-dd");
??? ?
??? }
??? /*****************************************
???? * @功能???? 计算某年某周的结束日期
???? * @return? interger
???? * @throws ParseException
???? ****************************************/
??? public String getYearWeekEndDay(int yearNum,int weekNum) throws ParseException {
??? ?Calendar cal = Calendar.getInstance();
??? ?cal.set(Calendar.YEAR, yearNum);
??? ?cal.set(Calendar.WEEK_OF_YEAR, weekNum + 1);
??? ?cal.set(Calendar.DAY_OF_WEEK, Calendar.SUNDAY);
??????? //分别取得当前日期的年、月、日
??? ?String tempYear = Integer.toString(yearNum);
??? ?String tempMonth = Integer.toString(cal.get(Calendar.MONTH) + 1);
??? ?String tempDay = Integer.toString(cal.get(Calendar.DATE));
??? ?String tempDate = tempYear + "-" +tempMonth + "-" + tempDay;
??? ?return SetDateFormat(tempDate,"yyyy-MM-dd");
??? }
???
???
??? /*****************************************
???? * @功能???? 计算某年某月的开始日期
???? * @return? interger
???? * @throws ParseException
???? ****************************************/
??? public String getYearMonthFirstDay(int yearNum,int monthNum) throws ParseException {
??? ?
??? ?//分别取得当前日期的年、月、日
??? ?String tempYear = Integer.toString(yearNum);
??? ?String tempMonth = Integer.toString(monthNum);
??? ?String tempDay = "1";
??? ?String tempDate = tempYear + "-" +tempMonth + "-" + tempDay;
??? ?return SetDateFormat(tempDate,"yyyy-MM-dd");
??? ?
??? }
??? /*****************************************
???? * @功能???? 计算某年某月的结束日期
???? * @return? interger
???? * @throws ParseException
???? ****************************************/
??? public String getYearMonthEndDay(int yearNum,int monthNum) throws ParseException {
??? ?
?????? //分别取得当前日期的年、月、日
??? ?String tempYear = Integer.toString(yearNum);
??? ?String tempMonth = Integer.toString(monthNum);
??? ?String tempDay = "31";
??? ?if (tempMonth.equals("1") || tempMonth.equals("3") || tempMonth.equals("5") || tempMonth.equals("7") ||tempMonth.equals("8") || tempMonth.equals("10") ||tempMonth.equals("12")) {
??? ??tempDay = "31";
??? ?}
??? ?if (tempMonth.equals("4") || tempMonth.equals("6") || tempMonth.equals("9")||tempMonth.equals("11")) {
??? ??tempDay = "30";
??? ?}
??? ?if (tempMonth.equals("2")) {
??? ??if (isLeapYear(yearNum)) {
??? ???tempDay = "29";
??? ??} else {
??? ???? tempDay = "28";
??? ??}
??? ?}
??? ?//System.out.println("tempDay:" + tempDay);
??? ?String tempDate = tempYear + "-" +tempMonth + "-" + tempDay;
??? ?return SetDateFormat(tempDate,"yyyy-MM-dd");
??? }
}
1 楼 dada 2007-03-14 写之前最好仔细看看calendar的api. 2 楼 hxweb 2007-03-14 感谢指正错误！ 3 楼 hxweb 2007-03-14 欢迎大家讨论