java 对日期的运算操作

package com.ilantu.common.date;

import java.io.Serializable;
import java.sql.Timestamp;
import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
import java.util.Locale;
import java.util.TimeZone;

public class DateUtil implements Serializable{
	
	public static final TimeZone NewYorkTimeZone = TimeZone.getTimeZone("America/New_York");
	public static final TimeZone CSTTimeZone = TimeZone.getTimeZone("CST");
	public static final TimeZone GMTTimeZone = TimeZone.getTimeZone("GMT");
	public static final TimeZone HKTimeZone = TimeZone.getTimeZone("Asia/Hong_Kong");
	public static final TimeZone SHTimeZone = TimeZone.getTimeZone("Asia/Shanghai");
	public static final TimeZone KRCHTimeZone = TimeZone.getTimeZone("Asia/Karachi");
	public static final TimeZone PRCTimeZone = TimeZone.getTimeZone("PRC");
	public static final TimeZone CTTTimeZone = TimeZone.getTimeZone("CTT");
	public static final TimeZone MSTTimeZone = TimeZone.getTimeZone("MST");
	public static final TimeZone PSTTimeZone = TimeZone.getTimeZone("PST");
	public static final TimeZone ASTTimeZone = TimeZone.getTimeZone("AST");
	public static final TimeZone ESTTimeZone = TimeZone.getTimeZone("EST");
	
	/**
	 * Java Default DateFormat string for Application.
	 */
	public static final String DATEFORMAT = "EEE MMM dd hh:mm:ss z yyyy";
	/**
	 * Default Dateformat string for System Administration
	 */
	public static final String DEFAULT_ADMIN_DATE_FORMAT="yyyy-MM-dd HH:mm:ss";
	/**
	 * Default Dateformat string for System
	 */
	public static final String DEFAULT_SYSTEM_DATE_FORMAT="yyyy-MM-dd HH:mm:ss.SSS";
	/**
	 * Default Dateformat string for Bisiness
	 */
	public static final String DEFAULT_BIZ_DATE_FORMAT="yyyy-MM-dd";
	
	/**
	 * Default FSCS Date formatter
	 */
	public static final SimpleDateFormat DATEFORMATTER = new SimpleDateFormat(DATEFORMAT);

	/**
	 * Basic System Date formatter for innternal transfer.but not for presentation
	 */
	public static final SimpleDateFormat SYSTEM_DATE_FORMATTER = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss.SSS");
	/**
	 * basic FSCS Date formatter.
	 */
	public static final SimpleDateFormat FSCS_DATE_FORMATTER = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss.SSS");
	/**
	 * Default FSCS Business Date formatter
	 */
	public static final SimpleDateFormat FSCS_BIZ_DATE_FORMATTER = new SimpleDateFormat("yyyy-MM-dd");
	/**
	 * Basic FSCS Short Date formatter
	 */
	public static final SimpleDateFormat FSCS_SHORT_DATE_FORMATTER = new SimpleDateFormat("yy-MM-dd");
	/**
	 * Basic FSCS Admin Date formatter
	 */														
	public static final SimpleDateFormat FSCS_ADMIN_DATE_FORMATTER = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
	/**
	 * YYYYMMDD FSCS Date formatter
	 */
	public static final SimpleDateFormat YYYYMMDD_FORMATTER = new SimpleDateFormat("yyyyMMdd");

	/**
	 * Short YYYYMMDD FSCS Date formatter
	 */
	public static final SimpleDateFormat YYMMDD_FORMATTER = new SimpleDateFormat("yyMMdd");
	/**
	 * Full Date format as yyyy-MM-dd HH:mm:ss
	 */
	public static final SimpleDateFormat YYYY_MM_DD_HH_MM_SS_FORMATTER = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
	public static final SimpleDateFormat YYYYMMDDHHMMSS_FORMATTER = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
	
	
	  
	/**
	 * RMS limit Date formatter?
	 */
	public static final SimpleDateFormat YYYY_MMM_DD_HH_MM_SS_FORMATTER = new SimpleDateFormat("yyyy-MMM-dd HH:mm:ss");
	/**
	 * YYYYMMMDD  FSCS Date formatter
	 */	
	public static final SimpleDateFormat YYYY_MMM_DD_FORMATTER = new SimpleDateFormat("yyyy-MMM-dd");

	/**
	 * DDMMMYYYY FSCS Date formatter
	 */
	public static final SimpleDateFormat DD_MMM_YYYY_FORMATTER = new SimpleDateFormat("dd-MMM-yyyy");

	/**
	 * in the future, the param will be put into config.xml
	 */
	private static String currentDbms = "ORACLE";
	/**
	 * get GMT mean Time.
	 * @return java.util.Date
	 * @deprecated
	 */
	public static final Date getGMTTimeStamp() {
		/*long zoneOffset = fromZone.getRawOffset() - GMTTimeZone.getRawOffset();
		return new Date((date.getTime() - zoneOffset));*/		
		return toDate(new Date(), DateUtil.GMTTimeZone);
	}
	
	/**
	 * get GMT mean Time.
	 * @return java.sql.Timestamp
	 */
	public static final Date getGMTTimestamp() {
		return toDate(new Date(), DateUtil.GMTTimeZone);
	}

	public static final Timestamp getGMTSqlTimestamp() {
		return new java.sql.Timestamp(getGMTTimestamp().getTime());
	}


	public static final Date toDate(Date date, TimeZone timeZone) {
		Date dt = null;
		try {
			String ds = toString(date, timeZone);
			dt = FSCS_DATE_FORMATTER.parse(ds);
		} catch (ParseException ex) {
			
		}
		return dt;
	}


	public static final Date toDate(Date date, TimeZone fromZone, TimeZone toZone) {
		long zoneOffset = fromZone.getRawOffset() - toZone.getRawOffset();
		return new Date((date.getTime() - zoneOffset));
	}

	public static final Date toDate(String dateStr) {
		Date date = null;
		if(dateStr==null||dateStr.trim().length()==0){
			return null;
		}
		try {
			date = SYSTEM_DATE_FORMATTER.parse(dateStr);
		} catch (ParseException ex) {
			
		}
		if(date==null){
			try {
				date = FSCS_ADMIN_DATE_FORMATTER.parse(dateStr);
			} catch (ParseException ex) {
				
			}			
		}
		if(date==null)	{
			try {
				Locale loc=null;
				loc=Locale.getDefault();
				SimpleDateFormat sysFormatter=(SimpleDateFormat)DateFormat.getDateTimeInstance(DateFormat.MEDIUM,DateFormat.MEDIUM,loc);
				date = sysFormatter.parse(dateStr);
			} catch (ParseException ex) {
				
			}
		}
		return date;
	}
	

	public static final Date toDate(String dateStr,String format) {
		Date date = null;
		if(dateStr==null||dateStr.trim().length()==0){
			return null;
		}
		if(format==null||format.trim().length()==0){
			format=DEFAULT_ADMIN_DATE_FORMAT;
		}
		SimpleDateFormat formatter = new SimpleDateFormat(format);
		try {
			date = formatter.parse(dateStr);
		} catch (ParseException ex) {
			
		}
		if(date==null){
			formatter = new SimpleDateFormat(DEFAULT_SYSTEM_DATE_FORMAT);
			try {
				date = formatter.parse(dateStr);
			} catch (ParseException ex) {
				
			}			
		}
		if(date==null)	{
			try {
				Locale loc=null;
				loc=Locale.getDefault();
				SimpleDateFormat sysFormatter=(SimpleDateFormat)DateFormat.getDateTimeInstance(DateFormat.MEDIUM,DateFormat.MEDIUM,loc);
				date = sysFormatter.parse(dateStr);
			} catch (ParseException ex) {
				
			}
		}
		return date;
	}
	

	public static final Date toDate(String dateStr,SimpleDateFormat formatter) {
		Date date = null;
		if(dateStr==null||dateStr.trim().length()==0){
			return null;
		}
		try {
			date = formatter.parse(dateStr);
		} catch (ParseException ex) {
			
		}
		if(date==null)	{
			try {
				Locale loc=null;
				loc=Locale.getDefault();
				SimpleDateFormat sysFormatter=(SimpleDateFormat)DateFormat.getDateTimeInstance(DateFormat.MEDIUM,DateFormat.MEDIUM,loc);
				date = sysFormatter.parse(dateStr);
			} catch (ParseException ex) {
				
			}
		}
		return date;
	}
		

	public static final Date toBizDate(String dateStr){
		Date date = null;
		if(dateStr==null||dateStr.trim().length()==0){
			return null;
		}		
		try {
			date = FSCS_BIZ_DATE_FORMATTER.parse(dateStr);
		} catch (ParseException ex) {
			
		}
		if(date==null)	{
			try {
				Locale loc=null;
				loc=Locale.getDefault();
				SimpleDateFormat sysFormatter=(SimpleDateFormat)DateFormat.getDateInstance(DateFormat.MEDIUM,loc);
				date = sysFormatter.parse(dateStr);
				
			} catch (ParseException ex) {
				
			}
		}
		return date;		
	}

	public static final Date toShortDate(String dateStr) {
		Date date = null;
		if(dateStr==null||dateStr.trim().length()==0){
			return null;
		}		
		try {
			date = FSCS_SHORT_DATE_FORMATTER.parse(dateStr);
		} catch (ParseException ex) {
			
		}
		if(date==null)	{
			try {
				Locale loc=null;
				loc=Locale.getDefault();
				SimpleDateFormat sysFormatter=(SimpleDateFormat)DateFormat.getDateInstance(DateFormat.SHORT,loc);
				date = sysFormatter.parse(dateStr);
			} catch (ParseException ex) {
				
			}
		}
		return date;
	}

	public static final Date toSqlTimestamp(String dateStr) {
		return new java.sql.Timestamp(toDate(dateStr).getTime());	
	}
	public static Date toSqlTimestamp(String dateStr,String format) {
		return new java.sql.Timestamp(toDate(dateStr,format).getTime());	
	}

	public static String toString(Date date) {
		return FSCS_ADMIN_DATE_FORMATTER.format(date);
	}
	

	public static final String toString(Date date, String format) {
		Calendar calendar = Calendar.getInstance();
		SimpleDateFormat formatter = new SimpleDateFormat(format);
		formatter.setCalendar(calendar);
		return formatter.format(date);
	}

	public static final String toString(Date date, SimpleDateFormat formatter) {
		Calendar calendar = Calendar.getInstance();
		formatter.setCalendar(calendar);
		return formatter.format(date);
	}	


	public static final String toString(Date date, TimeZone timeZone) {
		return toString(date, timeZone, SYSTEM_DATE_FORMATTER);
	}
	

	public static final String toString(Date date, TimeZone timeZone, String format) {
		Calendar calendar = Calendar.getInstance(timeZone);
		SimpleDateFormat formatter = new SimpleDateFormat(format);
		formatter.setCalendar(calendar);
		return formatter.format(date);
	}	

	public static String toString(Date date, TimeZone timeZone,	SimpleDateFormat formatter) {
		Calendar calendar = Calendar.getInstance(timeZone);
		formatter.setCalendar(calendar);
		return formatter.format(date);
	}

	public static final String toBizString(Date date) {
		return FSCS_BIZ_DATE_FORMATTER.format(date);
	}
	

	public static String toBizString(Date date,String format) {
		String dateStr = null;
		if(format==null||format.trim().length()==0){
			format=DEFAULT_BIZ_DATE_FORMAT;
		}		
		SimpleDateFormat formatter = new SimpleDateFormat(format);
		dateStr = formatter.format(date);
		return dateStr;
	}			

	public static final String toShortString(Date date) {
		return FSCS_SHORT_DATE_FORMATTER.format(date);
	}	
			


	public static final int calculateDays(Date date1, Date date2) {
		Calendar c1 = Calendar.getInstance();
		Calendar c2 = Calendar.getInstance();
		c1.setTime(date1);
		c2.setTime(date2);
		long days = (c1.getTime().getTime() - c2.getTime().getTime() + (60*60*1000L))/(60*60*1000L*24);
		return (new Long(days)).intValue(); 
	}
	

	public static final boolean isBetweenDates(Date date1,Date date2,Date date){
		if(date.getTime()<=date2.getTime() && date.getTime()>=date1.getTime()){
			return true;
		}
		else{
			return false;
		}
	}

	public static final boolean isBetweenDates2(Date date1,Date date2,Date date){
		if(date.getTime()<date2.getTime() && date.getTime()>date1.getTime()){
			return true;
		}
		else{
			return false;
		}
	}	

	public static final boolean isWeekend(Date date) {
		Calendar cal = new GregorianCalendar();
		cal.setTime(date);
		if ((cal.get(Calendar.DAY_OF_WEEK) == Calendar.SUNDAY)
			|| (cal.get(Calendar.DAY_OF_WEEK) == Calendar.SATURDAY)) {
			return true;
		}
		return false;
	}

	public static final boolean isWeekday(Date date) {
		return !isWeekend(date);
	}
	

	public static final boolean isBeforeByDay(Date date1, Date date2) {
		int i = compareByDay(date1, date2);
		if (i < 0)
			return true;
		return false;
	}


	public static final boolean isAfterByDay(Date date1, Date date2) {
		int i = compareByDay(date1, date2);
		if (i > 0)
			return true;
		return false;
	}


	public static final boolean isOnSameDay(Date date1, Date date2) {
		int i = compareByDay(date1, date2);
		if (i == 0)
			return true;
		return false;
	}


	public static final int compareByDay(Date date1, Date date2) {
		String d1 = YYYYMMDD_FORMATTER.format(date1);
		String d2 = YYYYMMDD_FORMATTER.format(date2);
		int retVal = 0;
		try {
			int dateInt1 = Integer.parseInt(d1);
			int dateInt2 = Integer.parseInt(d2);
			if (dateInt1 > dateInt2) {
				retVal = 1;
			} else if (dateInt1 < dateInt2) {
				retVal = -1;
			}

		} catch (Exception e) {
			
		}
		return retVal;
	}
	
	public static final int compareByDateTime(Date date1, Date date2) {
		long d1=date1.getTime();
		long d2=date2.getTime();
		int retVal = 0;
		if (d1 > d2) {
			retVal = 1;
		} else if (d1 < d2) {
			retVal = -1;
		}
		return retVal;
	}
	
	public static final int compareByDateTime2(Date date1, Date date2) {
		long d1=date1.getTime()/1000;
		long d2=date2.getTime()/1000;
		int retVal = 0;
		if (d1 > d2) {
			retVal = 1;
		} else if (d1 < d2) {
			retVal = -1;
		}
		return retVal;
	}	
	
	public static final int compareByDate(Date date1, Date date2) {
		int d=calculateDays(date1,date2);
		if(d>0){
			return 1;
		}
		else if(d<0){
			return -1;
		}
		return d;
	}	

	public static final Date toDateWithoutMs(java.util.Date date){
		return new Date((date.getTime()/1000)*1000);
	}
	public static final Date toDateWithoutTime(java.util.Date date){
		//System.out.println("toDateWithoutTime:1"+new Date((date.getTime()/1000/60/60/24)*1000*60*60*24));
		return toBizDate(toBizString(date));
	}	

	public static final Date toGMTTimestamp(java.util.Date localDate){
		TimeZone localTimeZone = SHTimeZone;
		return DateUtil.toDate(localDate,localTimeZone,DateUtil.GMTTimeZone);
	}


	public static final Date toGMTTimestamp(java.sql.Timestamp localTimestamp){
		TimeZone localTimeZone = SHTimeZone;
		return DateUtil.toDate(localTimestamp,localTimeZone,DateUtil.GMTTimeZone);
	}

	public static final Timestamp toGMTSqlTimestamp(java.util.Date localDate){
		//TimeZone localTimeZone = ((UserProfile)(MyObjects.getInstance().getObject("WAF_USERPROFILE"))).getUser().getSiteTimeZone();
		return new Timestamp(toGMTTimestamp(localDate).getTime());
	}


	public static Timestamp toGMTSqlTimestamp(java.sql.Timestamp localTimestamp){
		//TimeZone localTimeZone = ((UserProfile)(MyObjects.getInstance().getObject("WAF_USERPROFILE"))).getUser().getSiteTimeZone();
		return new Timestamp(toGMTTimestamp(localTimestamp).getTime());
	}		


	public static Timestamp getNextGMTSqlTimestamp(java.util.Date localDate){
		return toGMTSqlTimestamp(getNextLocalDate(localDate));
		//return toGMTTimestamp(getNextLocalDate(new Date((localDate.getTime()/(24*60*60*1000L))*(24*60*60*1000L))));
	}


	public static final Timestamp getPreviousGMTSqlTimestamp(java.util.Date localDate){
		return toGMTSqlTimestamp(getPreviousLocalDate(localDate));
		//return toGMTTimestamp(getPreviousLocalDate(new Date((localDate.getTime()/(24*60*60*1000L))*(24*60*60*1000L))));
	}	


	public static final Date getNextGMTTimestamp(java.util.Date localDate){
		return toGMTTimestamp(getNextLocalDate(localDate));
		//return toGMTTimestamp(getNextLocalDate(new Date((localDate.getTime()/(24*60*60*1000L))*(24*60*60*1000L))));
	}


	public static final Date getPreviousGMTTimestamp(java.util.Date localDate){
		return toGMTTimestamp(getPreviousLocalDate(localDate));
		//return toGMTTimestamp(getNextLocalDate(new Date((localDate.getTime()/(24*60*60*1000L))*(24*60*60*1000L))));
	}


	public static final Date toLocalTimestamp(Timestamp gmtTimestamp){
		TimeZone localTimeZone = SHTimeZone;
		return DateUtil.toDate(gmtTimestamp,DateUtil.GMTTimeZone,localTimeZone);
	}
	


	public static final Date toLocalTimestamp(java.util.Date gmtDate){
		TimeZone localTimeZone = SHTimeZone;
		return DateUtil.toDate(gmtDate,DateUtil.GMTTimeZone,localTimeZone);
	}		


	public static final Date getNextLocalDate(Date date) {
		//TimeZone localTimeZone = ((UserProfile)(MyObjects.getInstance().getObject("WAF_USERPROFILE"))).getUser().getSiteTimeZone();
		return addDays(date,1);
	}


	public static final Date getPreviousLocalDate(Date date) {
		return addDays(date,-1);
	}	



	public static final java.sql.Date getNextLocalSqlDate(Date date) {
		return new java.sql.Date(getNextLocalDate(date).getTime());
	}



	public static final java.sql.Date getPreviousLocalSqlDate(Date date) {
		return new java.sql.Date(getPreviousLocalDate(date).getTime());
	}	



	public static final String toLocalString(Date date){
				Locale loc=null;
				loc=Locale.getDefault();		
		SimpleDateFormat formatter = (SimpleDateFormat)DateFormat.getDateInstance(DateFormat.MEDIUM,loc);
		return formatter.format(date);
		
	}	



	public static final String toLocalString(Date date,String format) {
		Locale loc=Locale.getDefault();		
		return toLocalString(date,format,loc);
	}		



	public static final String toLocalString(Date date,String format,Locale locale) {
		String dateStr = null;
		if(format==null||format.trim().length()==0){
			format=DEFAULT_BIZ_DATE_FORMAT;
		}
		Locale loc=null;
		if(locale==null){
			loc=Locale.getDefault();
		}
		else{
			loc=locale;
		}
		SimpleDateFormat formatter = new SimpleDateFormat(format,loc);
		dateStr = formatter.format(date);
		return dateStr;
	}



	public static final String toFullLocalString(Date date){
		Locale loc=Locale.getDefault();		
		if(loc==null){
			loc=Locale.getDefault();
		}
		SimpleDateFormat formatter = (SimpleDateFormat)DateFormat.getDateTimeInstance(DateFormat.FULL,DateFormat.FULL,loc);
		return formatter.format(date);
		
	}



	public static final String toFullLocalString(Date date,String format,Locale locale) {
		String dateStr = null;
		if(format==null||format.trim().length()==0){
			format=DEFAULT_ADMIN_DATE_FORMAT;
		}
		Locale loc=null;
		if(locale==null){
			loc=Locale.getDefault();
		}
		else{
			loc=locale;
		}
		SimpleDateFormat formatter = new SimpleDateFormat(format,loc);
		dateStr = formatter.format(date);
		return dateStr;
	}


	public static final Date getHostDate(){
		return new Date();
	}
	public static final Date getNextHostDate(){
		return addDays(new Date(),1);
	}
	public static final Date getPreviousHostDate(){
		return addDays(new Date(),-1);
	}	



	public static final java.sql.Date getHostSqlDate(){
		return new java.sql.Date((new Date()).getTime());
	}



	public static final Date addDays(Date date,int days){
		if(date==null){
			return null;
		}		
		GregorianCalendar cal = new GregorianCalendar();
		cal.setTime(date);
		cal.add(Calendar.DATE, days);
		return cal.getTime();
	}

	public static final Date addWeeks(Date date,int weeks){
		GregorianCalendar cal = new GregorianCalendar();
		cal.setTime(date);
		cal.add(Calendar.DATE, weeks*7);
		return cal.getTime();
	}


	public static final Date addMonths(Date date,int months){
		GregorianCalendar cal = new GregorianCalendar();
		cal.setTime(date);
		cal.add(Calendar.MONTH, months);
		return cal.getTime();
	}


	public static final Date addQuarters(Date date,int quarters){
		if(date==null){
			return null;
		}		
		GregorianCalendar cal = new GregorianCalendar();
		cal.setTime(date);
		cal.add(Calendar.MONTH, quarters*3);
		return cal.getTime();
	}



	public static final Date addYears(Date date,int years){
		if(date==null){
			return null;
		}		
		GregorianCalendar cal = new GregorianCalendar();
		cal.setTime(date);
		cal.add(Calendar.YEAR, years);
		return cal.getTime();
	}


	public static final boolean isLeapYear(Date date){
		if(date==null){
			return false;
		}		
		Calendar cal = Calendar.getInstance();
		cal.setTime(date);
		int year=cal.get(Calendar.YEAR);
		if (year % 4 == 0) {
			if (year % 400 == 0) {
				return true;
			} else if (year % 100 != 0) {
				return true;
			}
		}
		return false;
	}


	public static final Date getFirstDayOfWeek(Date date){
		if(date==null){
			return null;
		}		
		Locale locale =Locale.getDefault();		
		//Locale locale=Locale.CHINESE;
		Calendar cal = Calendar.getInstance(locale);
		cal.setTime(date);
		int days=cal.get(Calendar.DAY_OF_WEEK);
		return addDays(date,(-1)*days+1);	
	}



	public static final Date getLastDayOfWeek(Date date){
		if(date==null){
			return null;
		}
		Locale locale =Locale.getDefault();		
		//Locale locale=Locale.CHINESE;
		Calendar cal = Calendar.getInstance(locale);
		cal.setTime(date);
		int days=cal.get(Calendar.DAY_OF_WEEK);	
		return addDays(date,7-days);
	}	



	public static final Date getFirstDayOfMonth(Date date){
		if(date==null){
			return null;
		}		
		Calendar cal = Calendar.getInstance();
		cal.setTime(date);
		cal.set(Calendar.DATE,1);
		return cal.getTime();	
	}



	public static final Date getLastDayOfMonth(Date date){
		if(date==null){
			return null;
		}		
		Calendar cal = Calendar.getInstance();
		cal.setTime(date);
		cal.set(Calendar.DATE,1);
		cal.add(Calendar.MONTH,1);		
		cal.add(Calendar.DATE,-1);
		return cal.getTime();	
	}

	public static final Date getFirstBizDayOfMonth(Date date){
		if(date==null){
			return null;
		}		
		Calendar cal = Calendar.getInstance();
		cal.setTime(date);
		cal.set(Calendar.DATE,1);
		return cal.getTime();	
	}
	public static final Date getLastBizDayOfMonth(Date date){
		if(date==null){
			return null;
		}
		Calendar cal = Calendar.getInstance();
		cal.setTime(date);
		cal.set(Calendar.DATE,1);
		cal.add(Calendar.MONTH,1);		
		cal.add(Calendar.DATE,-1);
		return cal.getTime();	
	}	



	public static final Date getFirstDayOfPreviousMonth(Date date){
		if(date==null){
			return null;
		}		
		Calendar cal = Calendar.getInstance();
		cal.setTime(date);
		cal.add(Calendar.MONTH,-1);
		cal.set(Calendar.DATE,1);
		return cal.getTime();	
	}



	public static final Date getLastDayOfPreviousMonth(Date date){
		if(date==null){
			return null;
		}		
		Calendar cal = Calendar.getInstance();
		cal.setTime(date);
		cal.add(Calendar.MONTH,-1);
		cal.set(Calendar.DATE,1);		
		return getLastDayOfMonth(cal.getTime());	
	}



	public static final Date getFirstDayOfNextMonth(Date date){
		if(date==null){
			return null;
		}		
		Calendar cal = Calendar.getInstance();
		cal.setTime(date);
		cal.add(Calendar.MONTH,1);
		cal.set(Calendar.DATE,1);
		return cal.getTime();	
	}



	public static final Date getLastDayOfNextMonth(Date date){
		if(date==null){
			return null;
		}		
		Calendar cal = Calendar.getInstance();
		cal.setTime(date);
		cal.add(Calendar.MONTH,1);
		cal.set(Calendar.DATE,1);		
		return getLastDayOfMonth(cal.getTime());	
	}	



	public static final Date getFirstDayOfQuarter(Date date){
		if(date==null){
			return null;
		}		
		Calendar cal = Calendar.getInstance();
		cal.setTime(date);
		int month=cal.get(Calendar.MONTH);
		int quarter=month/3;
		
		cal.set(Calendar.MONTH,quarter*3);
		cal.set(Calendar.DATE,1);
		return cal.getTime();			
	}


	public static final Date getLastDayOfQuarter(Date date){
		if(date==null){
			return null;
		}		
		Calendar cal = Calendar.getInstance();
		cal.setTime(date);
		int month=cal.get(Calendar.MONTH);
		int quarter=month/3;
		
		cal.set(Calendar.MONTH,quarter*3+2);
		cal.set(Calendar.DATE,1);
		return getLastDayOfMonth(cal.getTime());			
	}	


	public static final Date getFirstDayOfYear(Date date){
		if(date==null){
			return null;
		}		
		Calendar cal = Calendar.getInstance();
		cal.setTime(date);
		cal.set(Calendar.MONTH,1);
		cal.set(Calendar.DATE,1);
		return cal.getTime();			
	}
	public static final Date getFirstDayOfYear(int year){
		return toBizDate(year+"01-01");	
	}


	public static final Date getLastDayOfYear(Date date){
		if(date==null){
			return null;
		}		
		Calendar cal = Calendar.getInstance();
		cal.setTime(date);
		cal.set(Calendar.MONTH,11);
		cal.set(Calendar.DATE,31);
		return cal.getTime();			
	}
	public static final Date getLastDayOfYear(int year){
		return toBizDate(year+"12-31");	
	}


	public static final Date getBeginTimeOfDay(Date date){
		return toBizDate(toBizString(date));
	}


	public static final Date getEndTimeOfDay(Date date){
		return new Date(toBizDate(toBizString(addDays(date,1))).getTime()-1000);
	}


	public static final Date getEndTimeOfDay2(Date date){
		return toBizDate(toBizString(addDays(date,1)));
	}


	public static final Date getGMTBeginTimeOfDay(Date date){
		return getBeginTimeOfDay(toGMTTimestamp(date));	
	}

	public static final Date getGMTEndTimeOfDay(Date date){
		return getEndTimeOfDay(toGMTTimestamp(date));	
	}	

}