java处理年、月、周次以及起至日期大全

/*
* 创建日期 2010-04-19
*
* 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



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" + m

Name[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 Pars

eException {

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 = &q

uot;28";
}
}
//System.out.println("tempDay:" + tempDay);
String tempDate = tempYear + "-" +tempMonth + "-" + tempDay;
return SetDateFormat(tempDate,"yyyy-MM-dd");

}

}