I'll be back!

/**?*/ /**
???*?字符串轉換為java.util.Date<br>
???*?支持格式為?yyyy.MM.dd?G?'at'?hh:mm:ss?z?如?'2002-1-1?AD?at?22:10:59?PSD'<br>
???*?yy/MM/dd?HH:mm:ss?如?'2002/1/1?17:55:00'<br>
???*?yy/MM/dd?HH:mm:ss?pm??如?'2002/1/1?17:55:00?pm'<br>
???*?yy-MM-dd?HH:mm:ss?如?'2002-1-1?17:55:00'?<br>
???*?yy-MM-dd?HH:mm:ss?am?如?'2002-1-1?17:55:00?am'?<br>
???*? @param ?time?String?字符串<br>
???*? @return ?Date?日期<br>
??? */
?? public ? static ?Date?stringToDate(String?time) {
????SimpleDateFormat?formatter;
???? int ?tempPos = time.indexOf( " AD " )?;
????time = time.trim()?;
????formatter? = ? new ?SimpleDateFormat?( " yyyy.MM.dd?G?'at'?hh:mm:ss?z " );
???? if (tempPos >- 1 ) {
??????time = time.substring( 0 ,tempPos) +
??????????? " 公元 " + time.substring(tempPos + " AD " .length()); // china
??????formatter? = ? new ?SimpleDateFormat?( " yyyy.MM.dd?G?'at'?hh:mm:ss?z " );
????}
????tempPos = time.indexOf( " - " );
???? if (tempPos >- 1 && (time.indexOf( " ? " ) < 0 )) {
??????formatter? = ? new ?SimpleDateFormat?( " yyyyMMddHHmmssZ " );
????}
???? else ? if ((time.indexOf( " / " ) >- 1 )? && (time.indexOf( " ? " ) >- 1 )) {
??????formatter? = ? new ?SimpleDateFormat?( " yyyy/MM/dd?HH:mm:ss " );
????}
???? else ? if ((time.indexOf( " - " ) >- 1 )? && (time.indexOf( " ? " ) >- 1 )) {
??????formatter? = ? new ?SimpleDateFormat?( " yyyy-MM-dd?HH:mm:ss " );
????}
???? else ? if ((time.indexOf( " / " ) >- 1 )? && (time.indexOf( " am " ) >- 1 )? || (time.indexOf( " pm " ) >- 1 )) {
??????formatter? = ? new ?SimpleDateFormat?( " yyyy-MM-dd?KK:mm:ss?a " );
????}
???? else ? if ((time.indexOf( " - " ) >- 1 )? && (time.indexOf( " am " ) >- 1 )? || (time.indexOf( " pm " ) >- 1 )) {
??????formatter? = ? new ?SimpleDateFormat?( " yyyy-MM-dd?KK:mm:ss?a " );
????}
????ParsePosition?pos? = ? new ?ParsePosition( 0 );
????java.util.Date?ctime? = ?formatter.parse(time,?pos);

???? return ?ctime;
??}
?? /**?*/ /**
???*?將java.util.Date?格式轉換為字符串格式'yyyy-MM-dd?HH:mm:ss'(24小時制)<br>
???*?如Sat?May?11?17:24:21?CST?2002?to?'2002-05-11?17:24:21'<br>
???*? @param ?time?Date?日期<br>
???*? @return ?String???字符串<br>
??? */
???

?? public ? static ?String?dateToString(Date?time) {
????SimpleDateFormat?formatter;
????formatter? = ? new ?SimpleDateFormat?( " yyyy-MM-dd?HH:mm:ss " );
????String?ctime? = ?formatter.format(time);

???? return ?ctime;
??}
?? /**?*/ /**
???*?將java.util.Date?格式轉換為字符串格式'yyyy-MM-dd?HH:mm:ss?a'(12小時制)<br>
???*?如Sat?May?11?17:23:22?CST?2002?to?'2002-05-11?05:23:22?下午'<br>
???*? @param ?time?Date?日期<br>
???*? @param ?x?int?任意整數如：1<br>
???*? @return ?String?字符串<br>
??? */
?? public ? static ?String?dateToString(Date?time, int ?x) {
????SimpleDateFormat?formatter;
????formatter? = ? new ?SimpleDateFormat?( " yyyy-MM-dd?KK:mm:ss?a " );
????String?ctime? = ?formatter.format(time);

???? return ?ctime;
??}
?? /**?*/ /**
???*取系統當前時間:返回只值為如下形式
???*2002-10-30?20:24:39
???*? @return ?String
??? */
?? public ? static ?String?Now() {
???? return ?dateToString( new ?Date());
??}

?? /**?*/ /**
???*取系統當前時間:返回只值為如下形式
???*2002-10-30?08:28:56?下午
???* @param ?hour?為任意整數
???* @return ?String
??? */
?? public ? static ?String?Now( int ?hour) {
???? return ?dateToString( new ?Date(),hour);
??}
?? /**?*/ /**
???*取系統當前時間:返回值為如下形式
???*2002-10-30
???* @return ?String
??? */
?? public ? static ?String?getYYYY_MM_DD() {
???? return ?dateToString( new ?Date()).substring( 0 , 10 );

??}
?? /**?*/ /**
???*取系統給定時間:返回值為如下形式
???*2002-10-30
???* @return ?String
??? */
??? public ? static ?String?getYYYY_MM_DD(String?date) {
???? return ?date.substring( 0 , 10 );

??}

?? public ? static ?String?getHour() {
????SimpleDateFormat?formatter;
????formatter? = ? new ?SimpleDateFormat?( " H " );
????String?ctime? = ?formatter.format( new ?Date());
???? return ?ctime;
????}

?? public ? static ?String?getDay() {
??????SimpleDateFormat?formatter;
????formatter? = ? new ?SimpleDateFormat?( " d " );
????String?ctime? = ?formatter.format( new ?Date());
???? return ?ctime;
????}

?? public ? static ?String?getMonth() {
????SimpleDateFormat?formatter;
????formatter? = ? new ?SimpleDateFormat?( " M " );
????String?ctime? = ?formatter.format( new ?Date());
???? return ?ctime;
????}
??

?? public ? static ?String?getYear() {
????SimpleDateFormat?formatter;
????formatter? = ? new ?SimpleDateFormat?( " yyyy " );
????String?ctime? = ?formatter.format( new ?Date());
???? return ?ctime;
????}
??????
?? public ? static ?String?getWeek() {
????SimpleDateFormat?formatter;
????formatter? = ? new ?SimpleDateFormat?( " E " );
????String?ctime? = ?formatter.format( new ?Date());
???? return ?ctime;
????} ?

在頁面上顯示輸出時，用下面的函數處理一下

public?class?DateUtil(){
????public?static?String?fmtShortEnu(Date?myDate)?{
????SimpleDateFormat?formatter?=?new?SimpleDateFormat("yyyy/MM/dd");
????String?strDate?=?formatter.format(myDate);
????return?strDate;
??}
}

new java.text.SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
new java.text.SimpleDateFormat("yyyy-MM-dd")
建議還是把sqlserver的字段類型改成varchar的吧，用字符串處理可以完全按照自己的意愿處理，沒有特殊的需求，不要使用date型

字串日期格式轉換
用的API是SimpleDateFormat，它是屬於java.text.SimpleDateFormat，所以請記得import進來！

用法：
SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
這一行最重要，它確立了轉換的格式，yyyy是完整的西元年，MM是月份，dd是日期， 至於HH:mm:ss就不需要我再解釋了吧！
ps:為什麼有的格式大寫，有的格式小寫，那是怕避免混淆，例如MM是月份，mm是分；HH是24小時制，而hh是12小時制

1.字串轉日期：
　2002-10-8 15:30:22要把它轉成日期，可以用
　Date date=sdf.parse("2002-10-8 15:30:22");
2.日期轉字串
　假如把今天的日期轉成字串可用
　String datestr=sdf.format(new Date());
　這個字串的內容便類似2002-10-08 14:55:38

透過這個API我們便可以隨心所欲的將日期轉成我們想要的字串格式，例如希望將日期輸出成2002年10月08日，
我們可以這麼寫：
SimpleDateFormat sdf=new SimpleDateFormat("yyyy年MM月dd日");
String datestr=sdf.format(new Date());
datestr便會依照我們設定的格式輸出

//對日期格式的轉換成（"yyyy-MM-dd"）格式的方法
public?java.sql.Date?Convert(String?str)
??{
????java.text.SimpleDateFormat?sdf?=?new?java.text.SimpleDateFormat("yyyy-MM-dd");
????try
????{
??????java.util.Date?d?=?sdf.parse(str);
??????java.sql.Date?d1?=?new?java.sql.Date(d.getTime());
??????return?d1;
????}
????catch(Exception?ex)
????{
??????ex.printStackTrace();
??????return?null;
????}
??}

????????GregorianCalendar?cal??=???new??GregorianCalendar();
????????Date?now??=???new??Date();
????????cal.setTime(now);
????????cal.setFirstDayOfWeek(GregorianCalendar.MONDAY);???//?設置一個星期的第一天為星期1，默認是星期日?
????????SimpleDateFormat?dateutil??=???new??SimpleDateFormat(?"?yyyy-MM-dd?"?);
????????System.out.println(?"?now=?"?+?dateutil.format(cal.getTime()));??//?今天?
????????
????????cal.add(GregorianCalendar.DATE,?-?1?);
????????System.out.println(?"?now=?"?+?dateutil.format(cal.getTime()));?//?昨天?????????
????????
????????cal.set(GregorianCalendar.DAY_OF_WEEK,?GregorianCalendar.MONDAY);
????????System.out.println(?"?now=?"?+?dateutil.format(cal.getTime()));???//?本周1?

????????cal.set(GregorianCalendar.DAY_OF_MONTH,??1?);?
????????System.out.println(?"?now=?"?+?dateutil.format(cal.getTime()));?//?本月1日?