Date () simple date calculation

/**

* Determines whether it is a leap year.

* @ Param year

* @ Return

*/

Public Boolean isleap (INT year)

{

If (Year % 4 = 0 & amp; Year % 100! = 0) | (Year % 400 = 0 ))

Return true;

Else

Return false;

}

/**

* Determine the total number of days of a month in a year

* @ Param year

* @ Param month

* @ Return

*/

Public int getdays (INT year, int month ){

Int tianshu = 0;

Switch (month)

{

Case 1:

Case 3:

Case 5:

Case 7:

Case 8:

Case 10:

Case 12:

Tianshu = 31;

Break;

Case 4:

Case 6:

Case 9:

Case 11:

Tianshu = 30;

Break;

Case 2:

If (isleap (year) = true)

{

Tianshu = 29;

}

Else

{

Tianshu = 28;

}

Break;

}

Return tianshu;

}

/**

* Add days or months to a date ().

* @ Return new date

*/

Public static string changedate (string STR, int N ){

Simpledateformat SDF = new simpledateformat ("yyyy-mm-dd hh: mm: SS ");

Try {

Calendar Cd = calendar. getinstance ();

CD. settime (SDF. parse (STR ));

CD. Add (calendar. Date, N );// Add one day after approval

// CD. Add (calendar. Month, N );// Add a month

Return SDF. Format (CD. gettime ());

} Catch (exception e ){

Global. getinstance (). logerror (E );

Return STR;

}

}

// Add or subtract two dates ()

Public static void main (string [] ARGs ){

Try {

Simpledateformat DFS = new simpledateformat ("yyyy-mm-dd ");

Date begin = DFS. parse ("1992-08-10 ");

Date end = new date ();

Long between = (end. gettime ()-begin. gettime ()/1000;// Divide by 1000 to convert to seconds

Long day1 = between/(24*3600 );// Several days

Long hour1 = between % (24*3600)/3600;// Zero hours

Long minute1 = maid % 3600/60;// Zero minutes

Long second1 = maid % 60/60;// Zero seconds

} Catch (parseexception e ){

E. printstacktrace ();

}

}

// Enter a person's birthday to calculate the actual age

Public static int getage (string date ){

Try {

Simpledateformat DFS = new simpledateformat ("yyyy-mm-dd ");

Date begin = DFS. parse (date );

Int month = begin. getmonth () + 1;

Int day = begin. getdate ();

Date end = new date ();

Long between = (end. gettime ()-begin. gettime ()/1000;

Long day1 = between/(24*3600 );

Int age = (INT) (day1/365 );

Long nmonth = end. getmonth () + 1;

Long nday = end. getdate ();

If (nmonth <month | (nmonth = month & day <nday )){

Age --;

}

Return age;

} Catch (exception e ){

E. printstacktrace ();

Return 0;

}

}