Date usage in Java

----------------------------------------------- Return time difference

 

Import java. Text .*;

Import java. util. date;

Public class demo {
Public static void main (string [] ARGs) throws exception {

Simpledateformat df = new simpledateformat ("yyyy-mm-dd hh: mm: SS ");
Date begin = DF. parse ("11:30:24 ");
Date end = DF. parse ("13:31:40 ");
Long between = (end. gettime ()-begin. gettime ()/1000; // divide by 1000 to convert to seconds
Long day = between/(24*3600); // day
Long hour = between % (24*3600)/3600; // hour
Long minute = between % 3600/60; // minute
Long second = between % 60/60; // second

System. Out. println (day + "day" + hour + "Hour" + minute + "Minute" + second + "second ");


}
}

 

-------------------------------------------------------------- Obtain information in the date object

 

Date D2 = new date ();

// Year

Int year = d2.getyear () + 1900;

// Month

Int month = d2.getmonth () + 1;

// Date

Int date = d2.getdate ();

// Hour

Int hour = d2.gethours ();

// Minute

Int minute = d2.getminutes ();

// Second

Int second = d2.getseconds ();

// Day of the week

Int day = d2.getday ();

System. Out. println ("year:" + year );

System. Out. println ("month:" + month );

System. Out. println ("Date:" + date );

System. Out. println ("hour:" + hour );

System. Out. println ("Min:" + minute );

System. Out. println ("seconds:" + second );

System. Out. println ("Week:" + Day );

----------------------------------------------------------------

Import java. util .*;

 

/**

* Calculate the number of days between two dates

*/

Public class dateexample1 {

Public static void main (string [] ARGs ){

// Set two dates

// Date: January 1, March 11, 2009

Calendar C1 = calendar. getinstance ();

C1.set (2009, 3-1, 11 );

// Date: January 1, April 1, 2010

Calendar C2 = calendar. getinstance ();

C2.set (2010, 4-1, 1 );

// Convert to relative time

Long T1 = c1.gettimeinmillis ();

Long T2 = c2.gettimeinmillis ();

// Calculates the number of days

Long days = (T2-t1)/(24x60*60*1000 );

System. Out. println (days );

}

}

Some code comes from: http://blog.csdn.net/Mailbomb/archive/2009/03/10/3976465.aspx