Calculate the number of days between two times

1 The first Kind

Import java.text.ParseException;

Import Java.text.SimpleDateFormat;

Import Java.util.Calendar;

Import Java.util.Date;

public class Test {

public static void Main (string[] args) {

try {

Time Conversion class

SimpleDateFormat SDF = new SimpleDateFormat ("Yyyy-mm-dd");

Date date1 = Sdf.parse ("2014-1-10");

Date date2 = Sdf.parse ("2012-12-20");

Converts two time objects converted to Calendard objects

Calendar can1 = Calendar.getinstance ();

Can1.settime (date1);

Calendar can2 = Calendar.getinstance ();

Can2.settime (DATE2);

Take out two years

int year1 = Can1.get (calendar.year);

int year2 = Can2.get (calendar.year);

Days

int days = 0;

Calendar can = null;

If Can1 < can2

Minus the number of days that a small time has elapsed in this year

Plus the number of days that the big time has elapsed

if (Can1.before (can2)) {

Days-= Can1.get (calendar.day_of_year);

Days + = Can2.get (calendar.day_of_year);

can = Can1;

}else{

Days-= Can2.get (calendar.day_of_year);

Days + = Can1.get (calendar.day_of_year);

can = can2;

}

for (int i = 0; i < Math.Abs (year2-year1); i++) {

Get the total number of days in a small time current year

Days + = Can.getactualmaximum (calendar.day_of_year);

And calculate the next year.

Can.add (calendar.year, 1);

}

System.out.println ("Days Difference:" +days);

} catch (ParseException e) {

E.printstacktrace ();

}

}

}

Console:

Days difference: 386

2 the second type

First, the obtained string date is converted to the date type (the day from the foreground page is a string type, A, b):

Date A1 = new SimpleDateFormat ("Yyyy-mm-dd"). Parse (a);

Date B1 = new SimpleDateFormat ("Yyyy-mm-dd"). Parse (b);

Gets the number of days after subtraction

Long day = (A1.gettime ()-b1.gettime ())/(24*60*60*1000);

I hope I can help you.

Third Kind

Number of days apart

Date D1 = new Date ();

Date D2 = new Date (2013,10,23,14,15,26);

int days = (int) ((D1.gettime ()-d2.gettime ())/86400000);

System.out.println ("interval:" + days);

The third way the transformation of the time a bit of a problem I hope who can help me to improve the next, the first and second can be converted but note that the second time to calculate the number of days need to distinguish the size of the time, otherwise it will be calculated negative.

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Calculate the number of days between two times