java常用的當(dāng)前時間獲取方法

1、1:int y,m,d,h,mm;Calendar c = Calendar.getlnstance();y = c.get(Calendar.YEAR); /m = c.get(Calendar.MONTH) + 1; /d = c.get(Calendar.DAY_OF_MONTH); /h = c.get(Calendar.HOUR); /h2 = c.get(Calendar.HOUR_OF_DAY);mm = c.get(Calendar.MINUTE); /時12 小時制時24分小時制2:= Date now = new Date();DateFormat defaultForma

2、t =DateFormat.getDatelnstance();DateFormat shortFormat =DateFormat.getDatelnstance(DateFormat.SHORT);DateFormat mediumFormat =DateFormat.getDatelnstance(DateFormat.MEDIUM);DateFormat longFormat =DateFormat.getDateInstance(DateFormat LONG);DateFormat fullFormat =DateFormat.getDateInstance(DateFormat.

3、FULL);String defaultDate = defaultFormat.format(now);String shortDate = shortFormat.format(now);String mediumDate = mediumFormat.format(now);String longDate = longFormat.format(now); String fullDate = fullFormat.format(now);:" + defaultDate);:" + shortDate);:" + mediumDate);: " +

4、 longDate);: " + fullDate);4.如果只要年月日,可以用 substring。截取.或者用這個String time=newSimpleDateFormat("yyyy-MM-dd").format(Calendar.getlnstance().getTime);5.Date currentTime = new Date();SimpleDateFormat formatter = newSimpleDateFormat("yyyy-MM-dd");String dateString = formatter.format

5、(currentTime);dataString的格式就是2007-03-08這類型其他幾種獲取當(dāng)前系統(tǒng)時間和日期并格式化輸出 public class NowString public static void main(String args) SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");設(shè)置日期格式 new Date()為獲取當(dāng)前系統(tǒng)時間二.在數(shù)據(jù)庫里的日期只以年 -月-日的方式輸出，可以用下面兩種方法：1、 用convert。轉(zhuǎn)化函數(shù)：String sqlst = "se

6、lect convert(varchar(10),bookDate,126) as convertBookDatefrom roomBook where bookDate between '2007-4-10' and '2007-4-25'"2、利用 SimpleDateFormat類：先要輸入兩個 java 包：然后：定義日期格式：SimpleDateFormat sdf = new SimpleDateFormat(yy-MM-dd);sql 語句為：String sqlStr = "select bookDate from roomB

7、ook where bookDatebetween '2007-4-10' and '2007-4-25'"輸出：*java中獲取當(dāng)前日期和時間的方法public class TestDatepublic static void main(String args)Date now = new Date();SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy/MM/ddHH:mm:ss");可以方便地修改日期格式String hehe = dateFormat.format

8、( now );Calendar c = Calendar.getlnstance();可以對每個時間域單獨修改int year = c.get(Calendar.YEAR);int month = c.get(Calendar.MONTH);int date = c.get(Calendar.DATE);int hour = c.get(Calendar.HOUR_OF_DAY);int minute = c.get(Calendar.MINUTE);int second = c.get(Calendar.SECOND);+ "/" + month + "/" + date + " " +hour + ":" +minute + ":" + second);就可以將你剛得到的有時候要把Str