MATLAB: Function that transforms years into days

days to years

Hello. How do I write function to transform years into days?

Like this?

function numDay = year2days(year)
  numDay = days(datetime(year,12,31)-datetime(year,1,1))+1;
end

The following is one example:

>> year2days(2000)
ans =
 366

E.g.

the_date = '1900-01-01';
the_days = 10;
result = datetime(the_date) + the_days;

Then to get at the individual values, e.g.

[y,m,d] = ymd(result);

There may be more efficient approaches, but this works:

yr = [1960:2014]';
lpyr = (mod(yr,4)==0);
dpy = ones(size(yr))*365+lpyr;
csd = cumsum(dpy);
M = [yr [1; csd(1:end-1)+1]  csd dpy];