matlab输入年月日算一年中的第几天

clc,clear all,close all

disp 'This program calculates the day of year given the' ;

disp 'current date.' ;

month input 'Enter current month 1-12 :' ;

day input 'Enter current day 1-31 :' ;

year input 'Enter current year yyyy :' ;

%Check for leap year,and add extra day if necessary

if mod year,400 0

leap_day 1;%Years divisible by 400 are leap years

elseif mod year,100 0

leap_day 0;%Other centuries are not leap years

elseif mod year,4 0

leap_day 1;%Otherwise every 4th year is a leap year

else

leap_day 0;%Other years are not leap years

end

%Calculate day of year by adding current day to the

%days in previous months.

day_of_year day;

for ii 1:month-1

%Add days in months from January to last month

switch ii

case 1,3,5,7,8,10,12 ,

day_of_year day_of_year+31;

case 4,6,9,11 ,

day_of_year day_of_year+30;

case 2,

day_of_year day_of_year+28+leap_day;

end

end

%Tell user

fprintf 'The date%2d/%2d/%4d is day of year%d.\n',... month,day,year,day_of_year ;