获取各类时间

mport 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的类型转换 
 * @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()); 
} 

/** 
 * 获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()); 
} 

/** 
 * 获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()); 
} 

/** 
 * 获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()); 
} 

/** 
 * 获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())); 
} 

/** 
 * 由年月日构建java.sql.Date类型 
 * @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()); 
} 

/** 
 * 取得某月的天数 
 * @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); 
} 

/** 
 * 获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); 

} 

/** 
 * 获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); 
} 

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

/** 
 * 获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的类型转换 
 * @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; 
} 
} 
} 
}