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Java 时间类型详解

时间:2016-04-04 22:56:15      阅读:489      评论:0      收藏:0      [点我收藏+]

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SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

 1.Calendar 转化 String 

 //获取当前时间的具体情况,如年,月,日,week,date,分,秒等 
        Calendar calendat = Calendar.getInstance();

SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
String dateStr = sdf.format(calendar.getTime());

 


2.String 转化Calendar

String str="2010-5-27";
SimpleDateFormat sdf= new SimpleDateFormat("yyyy-MM-dd");

Date date =sdf.parse(str);

Calendar calendar = Calendar.getInstance();

calendar.setTime(date);

 

3.Date 转化String

SimpleDateFormat sdf= new SimpleDateFormat("yyyy-MM-dd");

String dateStr=sdf.format(new Date());

 

4.String 转化Date
String str="2010-5-27";

SimpleDateFormat sdf= new SimpleDateFormat("yyyy-MM-dd");

Date birthday = sdf.parse(str);

 

5.Date 转化Calendar

Calendar calendar = Calendar.getInstance();
calendar.setTime(new java.util.Date());

 

6.Calendar转化Date

Calendar calendar = Calendar.getInstance();
java.util.Date date =calendar.getTime();

 

7.Date 转成 String

System.out.println(sdf.format(new Date())); 

 

8.String 转成 Timestamp

Timestamp ts = Timestamp.valueOf("2011-1-14 08:11:00");

 

9.Timestamp 转成 String

sdf.format(ts);

 

TimestampDate多数用法是一样的。

10.Date TimeStamp

SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

String time = df.format(new Date());

Timestamp ts = Timestamp.valueOf(time);

 

11.日期比较大小

String ti="2010-11-25 20:11:00";
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); 
Date time=sdf.parse(ti);

String ti2="2011-11-26 20:11:00";
Date time2=sdf.parse(ti2);

int c=ti2.compareTo(ti);
if(c>0){
    System.out.println(ti+"大");
}else if(c==0){

    System.out.println("一样大");

}else{
    System.out.println(ti2+"大");
}

 

12.Date/ Timestamp 转成 Calendar 

Calendar calendar = Calendar.getInstance();
calendar.setTime(startDate);

calendar.add(Calendar.YEAR, 2);   //日期加2年
System.out.println(calendar.getTime());
calendar.add(Calendar.DATE, -30);     //日期加30天
System.out.println(calendar.getTime());
calendar.add(Calendar.MONTH, 3);  //日期加3个月
System.out.println(calendar.getTime());

 

DateUtil

 

       /**

               * 时间格式的转换(Timestamp转换为string)

               * @author zcm

               * @param time

               * @return String类型的时间格式字符串

               */

              public static String convert(Timestamp time) {

                     SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

                     String result = df.format((Date) time);

                     return result;

              }

             

              /**

               * 获取当时系统时间(timestamp

               * @author zcm

               * @return Timestamp类型的时间格式

               */

              public static Timestamp getNow() {

                     Date date = new Date();

                     SimpleDateFormat simDate = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

                     Timestamp now=Timestamp.valueOf(simDate.format(date));

                     return now;

              }

             

              /**

               * 将date转换为string类型yyyy-MM-dd

               * @param date

               * @return

               *@author Jimmy

               */

              public static String dateConvertToString(Date date){

                     SimpleDateFormat formatter = new SimpleDateFormat( "yyyy-MM-dd ");

                     String time = formatter.format(date);//格式化数据

                     return time;

              }

      

              /**

               * 获取当前时间的毫秒数

               * @return

               *@author Jimmy

               */

              public static Long  getTime(){

                       Date dt= new Date();

                       Long time= dt.getTime();

                     return time;

              }

             

              /**

               * 将字符串类型转换为calendar

               * @return

               *@author Jimmy

               * @throws ParseException

               */

              public static Calendar convertToCalendar(String date) throws ParseException{

                     Date d = new SimpleDateFormat("yyyy-MM-dd").parse(date);

                     Calendar cal=Calendar.getInstance();

                     cal.setTime(d);

                     return cal;

                    

              }

      

             

              public static void main(String[] args) throws ParseException { 

                      Calendar now = Calendar.getInstance(); 

                      System.out.println("年: " + now.get(Calendar.YEAR)); 

                      System.out.println("月: " + (now.get(Calendar.MONTH) + 1) + ""); 

                      System.out.println("日: " + now.get(Calendar.DAY_OF_MONTH)); 

                      System.out.println("时: " + now.get(Calendar.HOUR_OF_DAY)); 

                      System.out.println("分: " + now.get(Calendar.MINUTE)); 

                      System.out.println("秒: " + now.get(Calendar.SECOND)); 

                      System.out.println("当前时间毫秒数:" + now.getTimeInMillis()); 

                      System.out.println("当前月的天数:" + now.getActualMaximum(Calendar.DATE)); 

                

                      System.out.println(now.getTime()); 

                     

                      //给定日期查看最大数

                      now.set(Calendar.YEAR,2002);  

                      now.set(Calendar.MONTH,6);//7月  

                      int   maxDate   =   now.getActualMaximum(Calendar.DATE);

               

                      Date d = new Date(); 

                      System.out.println(d); 

                      SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); 

                      String dateNowStr = sdf.format(d); 

                      System.out.println("格式化后的日期:" + dateNowStr); 

                       

                      String str = "2012-1-13 17:26:33";  //要跟上面sdf定义的格式一样 

                      Date today = sdf.parse(str); 

                      System.out.println("字符串转成日期:" + today); 

           }  

Java 时间类型详解

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原文地址:http://www.cnblogs.com/jimmy-muyuan/p/5353100.html

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