字符串到java的日期时间 [英] String to date time in java

问题描述

我有一个日期时间字符串2013-06-04 23:59:59我想从这个字符串中分离日期和时间。

 新日期（2013-06-04 23:59:59）
  

java的构造函数已被弃用，所以我使用Calender类。我尝试过代码

 日历mydate = new GregorianCalendar（）; 
 String mystring =2013-06-04 23:59:59; 
 Date thedate = new SimpleDateFormat（yyyy-mm-dd HH：MM：SS，Locale.ENGLISH）.parse（mystring）; 
 mydate.setTime（thedate）; 
 //击穿
 System.out.println（mydate  - >+ mydate）; 
 System.out.println（year  - >+ mydate.get（Calendar.YEAR））; 
 System.out.println（month  - >+ mydate.get（Calendar.MONTH））; 
 System.out.println（dom  - >+ mydate.get（Calendar.DAY_OF_MONTH））; 
 System.out.println（dow  - >+ mydate.get（Calendar.DAY_OF_WEEK））; 
 System.out.println（hour  - >+ mydate.get（Calendar.HOUR））; 
 System.out.println（minute  - >+ mydate.get（Calendar.MINUTE））; 
 System.out.println（second  - >+ mydate.get（Calendar.SECOND））; 
 System.out.println（milli  - >+ mydate.get（Calendar.MILLISECOND））; 
 System.out.println（ampm  - >+ mydate.get（Calendar.AM_PM））; 
 System.out.println（hod  - >+ mydate.get（Calendar.HOUR_OF_DAY））; 
  

但结果错误。

  mydate  - > java.util.GregorianCalendar [time = 1509816960059，areFieldsSet = true，areAllFieldsSet = true，lenient = true，zone = sun.util.calendar.ZoneInfo [id =Asia / Calcutta，offset = 19800000，dstSavings = 0，useDaylight = false，transitions = 6，lastRule = null]，firstDayOfWeek = 1，minimumDaysInFirstWeek = 1，ERA = 1，YEAR = 2017，MONTH = 10，WEEK_OF_YEAR = 44，WEEK_OF_MONTH = 1，DAY_OF_MONTH = 4，DAY_OF_YEAR = 308，DAY_OF_WEEK = 7 ，DAY_OF_WEEK_IN_MONTH = 1，AM_PM = 1，HOUR = 11，HOUR_OF_DAY = 23，MINUTE = 6，SECOND = 0，MILLISECOND = 59，ZONE_OFFSET = 19800000，DST_OFFSET = 0] 
年 - > 2017 
月 - > 10 
 dom  - > 4 
 dow  - > 7 
小时 - > 11 
分钟 - > 6 
 second  - > 0 
 milli  - > 59 
 ampm  - > 1 
 hod  - > 23 
  

请确定我正在做的错误，并纠正错误。

我需要字符串中提到的值。

解决方案

你的错误模式。 MM 为月， mm 为分钟， ss 几秒钟。

使用：

 yyyy-MM-dd HH：mm：ss
  

另外，请注意， strong>，意味着它从 0 到 11 而不是 1 到 12 ：

 日历mydate = new GregorianCalendar（）; 
 String mystring =2013-06-04 23:59:59; 
日期thedate = new SimpleDateFormat（yyyy-MM-dd HH：mm：ss，Locale.ENGLISH）.parse（mystring）; 
 mydate.setTime（thedate）; 
 //击穿
 System.out.println（mydate  - >+ mydate）; 
 System.out.println（year  - >+ mydate.get（Calendar.YEAR））; 
 System.out.println（month  - >+（mydate.get（Calendar.MONTH）+1））; //<  -  correction 
 System.out.println（dom  - >+ mydate.get（Calendar.DAY_OF_MONTH））; 
 System.out.println（dow  - >+ mydate.get（Calendar.DAY_OF_WEEK））; 
 System.out.println（hour  - >+ mydate.get（Calendar.HOUR））; 
 System.out.println（minute  - >+ mydate.get（Calendar.MINUTE））; 
 System.out.println（second  - >+ mydate.get（Calendar.SECOND））; 
 System.out.println（milli  - >+ mydate.get（Calendar.MILLISECOND））; 
 System.out.println（ampm  - >+ mydate.get（Calendar.AM_PM））; 
 System.out.println（hod  - >+ mydate.get（Calendar.HOUR_OF_DAY））; 
  

I have a date time string "2013-06-04 23:59:59" I want to get the date and time separately from this string.

new Date ("2013-06-04 23:59:59") 

constructor of java has been deprecated so I used the Calender class. I have tried the code

Calendar mydate = new GregorianCalendar();
        String mystring = "2013-06-04 23:59:59";
        Date thedate = new SimpleDateFormat("yyyy-mm-dd HH:MM:SS", Locale.ENGLISH).parse(mystring);
        mydate.setTime(thedate);
        //breakdown
        System.out.println("mydate -> "+mydate);
        System.out.println("year   -> "+mydate.get(Calendar.YEAR));
        System.out.println("month  -> "+mydate.get(Calendar.MONTH));
        System.out.println("dom    -> "+mydate.get(Calendar.DAY_OF_MONTH));
        System.out.println("dow    -> "+mydate.get(Calendar.DAY_OF_WEEK));
        System.out.println("hour   -> "+mydate.get(Calendar.HOUR));
        System.out.println("minute -> "+mydate.get(Calendar.MINUTE));
        System.out.println("second -> "+mydate.get(Calendar.SECOND));
        System.out.println("milli  -> "+mydate.get(Calendar.MILLISECOND));
        System.out.println("ampm   -> "+mydate.get(Calendar.AM_PM));
        System.out.println("hod    -> "+mydate.get(Calendar.HOUR_OF_DAY));

but the result is wrong.

mydate -> java.util.GregorianCalendar[time=1509816960059,areFieldsSet=true,areAllFieldsSet=true,lenient=true,zone=sun.util.calendar.ZoneInfo[id="Asia/Calcutta",offset=19800000,dstSavings=0,useDaylight=false,transitions=6,lastRule=null],firstDayOfWeek=1,minimalDaysInFirstWeek=1,ERA=1,YEAR=2017,MONTH=10,WEEK_OF_YEAR=44,WEEK_OF_MONTH=1,DAY_OF_MONTH=4,DAY_OF_YEAR=308,DAY_OF_WEEK=7,DAY_OF_WEEK_IN_MONTH=1,AM_PM=1,HOUR=11,HOUR_OF_DAY=23,MINUTE=6,SECOND=0,MILLISECOND=59,ZONE_OFFSET=19800000,DST_OFFSET=0]
year   -> 2017
month  -> 10
dom    -> 4
dow    -> 7
hour   -> 11
minute -> 6
second -> 0
milli  -> 59
ampm   -> 1
hod    -> 23

Please figure out the mistake I am doing and rectify the error.

I need the values that are mentioned in the string.

解决方案

You got the wrong pattern. MM is for month, mm is for minutes and ss for seconds.

Use:

"yyyy-MM-dd HH:mm:ss"

Also, notice that the month is zero-based, meaning it goes from 0 to 11, not 1 to 12:

Calendar mydate = new GregorianCalendar();
String mystring = "2013-06-04 23:59:59";
Date thedate = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss", Locale.ENGLISH).parse(mystring);
mydate.setTime(thedate);
//breakdown
System.out.println("mydate -> "+mydate);
System.out.println("year   -> "+mydate.get(Calendar.YEAR));
System.out.println("month  -> "+(mydate.get(Calendar.MONTH)+1)); // <-- corrected
System.out.println("dom    -> "+mydate.get(Calendar.DAY_OF_MONTH));
System.out.println("dow    -> "+mydate.get(Calendar.DAY_OF_WEEK));
System.out.println("hour   -> "+mydate.get(Calendar.HOUR));
System.out.println("minute -> "+mydate.get(Calendar.MINUTE));
System.out.println("second -> "+mydate.get(Calendar.SECOND));
System.out.println("milli  -> "+mydate.get(Calendar.MILLISECOND));
System.out.println("ampm   -> "+mydate.get(Calendar.AM_PM));
System.out.println("hod    -> "+mydate.get(Calendar.HOUR_OF_DAY));

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