java 日期時間處理類

import java.util.Calendar;
import java.sql.Date;
import java.text.SimpleDateFormat;
import java.text.ParseException;

/**

Utility to date time
@version 0.1
@author Super Zhao
*/
public class DateTimeUtil
{
/**

由java.util.Date到java.sql.Date的類型轉換
@param date
@return Date
*/
public static Date getSqlDate (java.util.Date date)
{
 return new Date (date.getTime() );
}
public static Date nowDate()
{
 Calendar calendar = Calendar.getInstance();
 return getSqlDate (calendar.getTime() );
}
/**

獲得某一日期的后一天
@param date
@return Date
*/
public static Date getNextDate (Date date)
{
 Calendar calendar = Calendar.getInstance();
 calendar.setTime (date);
 int day = calendar.get (Calendar.DATE);
 calendar.set (Calendar.DATE, day + 1);
 return getSqlDate (calendar.getTime() );
}
/**

獲得某一日期的前一天
@param date
@return Date
*/
public static Date getPreviousDate (Date date)
{
 Calendar calendar = Calendar.getInstance();
 calendar.setTime (date);
 int day = calendar.get (Calendar.DATE);
 calendar.set (Calendar.DATE, day - 1);
 return getSqlDate (calendar.getTime() );
}
/**

獲得某年某月第一天的日期
@param year
@param month
@return Date
*/
public static Date getFirstDayOfMonth (int year, int month)
{
 Calendar calendar = Calendar.getInstance();
 calendar.set (Calendar.YEAR, year);
 calendar.set (Calendar.MONTH, month - 1);
 calendar.set (Calendar.DATE, 1);
 return getSqlDate (calendar.getTime() );
}
/**

獲得某年某月最后一天的日期
@param year
@param month
@return Date
*/
public static Date getLastDayOfMonth (int year, int month)
{
 Calendar calendar = Calendar.getInstance();
 calendar.set (Calendar.YEAR, year);
 calendar.set (Calendar.MONTH, month);
 calendar.set (Calendar.DATE, 1);
 return getPreviousDate (getSqlDate (calendar.getTime() ) );
}
/**

由年月日構建java.sql.Date類型
@param year
@param month
@param date
@return Date
*/
public static Date buildDate (int year, int month, int date)
{
 Calendar calendar = Calendar.getInstance();
 calendar.set (year, month - 1, date);
 return getSqlDate (calendar.getTime() );
}
/**

取得某月的天數
@param year
@param month
@return int
*/
public static int getDayCountOfMonth (int year, int month)
{
 Calendar calendar = Calendar.getInstance();
 calendar.set (Calendar.YEAR, year);
 calendar.set (Calendar.MONTH, month);
 calendar.set (Calendar.DATE, 0);
 return calendar.get (Calendar.DATE);
}
/**

獲得某年某季度的最后一天的日期
@param year
@param quarter
@return Date
*/
public static Date getLastDayOfQuarter (int year, int quarter)
{
 int month = 0;
 if (quarter > 4)
 {

 return null;

}
 else
 {

 month = quarter * 3;

}
 return getLastDayOfMonth (year, month);
}
/**

獲得某年某季度的第一天的日期
@param year
@param quarter
@return Date
*/
public static Date getFirstDayOfQuarter (int year, int quarter)
{
 int month = 0;
 if (quarter > 4)
 {

 return null;

}
 else
 {

 month = (quarter - 1) * 3 + 1;

}
 return getFirstDayOfMonth (year, month);
}
/**

獲得某年的第一天的日期
@param year
@return Date
*/
public static Date getFirstDayOfYear (int year)
{
 return getFirstDayOfMonth (year, 1);
}
/**

獲得某年的最后一天的日期
@param year
@return Date
*/
public static Date getLastDayOfYear (int year)
{
 return getLastDayOfMonth (year, 12);
}
/**

String到java.sql.Date的類型轉換
@param param
@return Date
*/
public static java.sql.Date StringToDate (String param)
{
 if (StringUtil.nullOrBlank (param) )
 {
 return null;

 }
 else
 {
 java.util.Date date = null;
 try
 {
     SimpleDateFormat sdf = new SimpleDateFormat ("yyyy-MM-dd");
     date = sdf.parse (param);
     return new Date (date.getTime() );
 }
 catch (ParseException ex)
 {
     //ex.printStackTrace();
     return null;
 }

 }
}
}
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