import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
/**
* 說明:日期處理
* @version
*/
public class DateUtil {
private final static SimpleDateFormat sdfYear = new SimpleDateFormat("yyyy");
private final static SimpleDateFormat sdfDay = new SimpleDateFormat("yyyy-MM-dd");
private final static SimpleDateFormat sdfDays = new SimpleDateFormat("yyyyMMdd");
private final static SimpleDateFormat sdfTime = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
private final static SimpleDateFormat sdfTimes = new SimpleDateFormat("yyyyMMddHHmmss");
/**
* 獲取YYYY格式
* @return
*/
public static String getSdfTimes() {
return sdfTimes.format(new Date());
}
/**
* 獲取YYYY格式
* @return
*/
public static String getYear() {
return sdfYear.format(new Date());
}
/**
* 獲取YYYY-MM-DD格式
* @return
*/
public static String getDay() {
return sdfDay.format(new Date());
}
/**
* 獲取YYYYMMDD格式
* @return
*/
public static String getDays(){
return sdfDays.format(new Date());
}
/**
* 獲取YYYY-MM-DD HH:mm:ss格式
* @return
*/
public static String getTime() {
return sdfTime.format(new Date());
}
/**
* @Title: compareDate
* @Description: TODO(日期比較,如果s>=e 返回true 否則返回false)
* @param s
* @param e
* @return boolean
* @throws
* @author fh
*/
public static boolean compareDate(String s, String e) {
if(fomatDate(s)==null||fomatDate(e)==null){
return false;
}
return fomatDate(s).getTime() >=fomatDate(e).getTime();
}
/**
* 格式化日期
* @return
*/
public static Date fomatDate(String date) {
DateFormat fmt = new SimpleDateFormat("yyyy-MM-dd");
try {
return fmt.parse(date);
} catch (ParseException e) {
e.printStackTrace();
return null;
}
}
/**
* 校驗日期是否合法
* @return
*/
public static boolean isValidDate(String s) {
DateFormat fmt = new SimpleDateFormat("yyyy-MM-dd");
try {
fmt.parse(s);
return true;
} catch (Exception e) {
// 如果throw java.text.ParseException或者NullPointerException,就說明格式不對
return false;
}
}
/**
* @param startTime
* @param endTime
* @return
*/
public static int getDiffYear(String startTime,String endTime) {
DateFormat fmt = new SimpleDateFormat("yyyy-MM-dd");
try {
//long aa=0;
int years=(int) (((fmt.parse(endTime).getTime()-fmt.parse(startTime).getTime())/ (1000 * 60 * 60 * 24))/365);
return years;
} catch (Exception e) {
// 如果throw java.text.ParseException或者NullPointerException,就說明格式不對
return 0;
}
}
/**
* <li>功能描述:時間相減得到天數
* @param beginDateStr
* @param endDateStr
* @return
* long
* @author Administrator
*/
public static long getDaySub(String beginDateStr,String endDateStr){
long day=0;
SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
Date beginDate = null;
Date endDate = null;
try {
beginDate = format.parse(beginDateStr);
endDate= format.parse(endDateStr);
} catch (ParseException e) {
e.printStackTrace();
}
day=(endDate.getTime()-beginDate.getTime())/(24*60*60*1000);
//System.out.println("相隔的天數="+day);
return day;
}
/**
* 得到n天之後的日期
* @param days
* @return
*/
public static String getAfterDayDate(String days) {
int daysInt = Integer.parseInt(days);
Calendar canlendar = Calendar.getInstance(); // java.util包
canlendar.add(Calendar.DATE, daysInt); // 日期減 如果不夠減會將月變動
Date date = canlendar.getTime();
SimpleDateFormat sdfd = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
String dateStr = sdfd.format(date);
return dateStr;
}
/**
* 得到n天之後是周幾
* @param days
* @return
*/
public static String getAfterDayWeek(String days) {
int daysInt = Integer.parseInt(days);
Calendar canlendar = Calendar.getInstance(); // java.util包
canlendar.add(Calendar.DATE, daysInt); // 日期減 如果不夠減會將月變動
Date date = canlendar.getTime();
SimpleDateFormat sdf = new SimpleDateFormat("E");
String dateStr = sdf.format(date);
return dateStr;
}
public static void main(String[] args) {
System.out.println(getDays());
System.out.println(getAfterDayWeek("3"));
}
}