Convert date to closest end-of-month date MATLAB -

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i need convert datenumber closest end-of-month date. found online link inefficient large matrix (at http://www.mathworks.com/matlabcentral/fileexchange/26374-round-off-dates-and-times). matlab (financial toolbox) has inbuilt function this? couldn't find it.

date_in = 734421 ; somefunction(date_in) --> sept 2010

thanks!

i had errors in previous version. here's logic incorporated function. checks month , updates accordingly.

function out = roundmonth(datenumber)     datevector = datevec(datenumber);     day = datevector(3);     month = datevector(2);     year = datevector(1);      month = month + sign(day - 15 + double(~(month-2)))...         + double(~(day-15 + double(~(month-2))));      datevector(1) = year + double((month-12)==1) - double((1-month)==1);     datevector(2) = mod(month,12) + 12*double(~mod(month,12));      out = datestr(datevector,'mmm yyyy');

examples:

1.

roundmonth(datenum('10-oct-2010'))  ans =  sep 2010

2.

roundmonth(datenum('20-oct-2010'))  ans =  nov 2010

3.

roundmonth(datenum('20-dec-2010'))  ans =  jan 2011

4.

roundmonth(datenum('10-jan-2010'))  ans =  dec 2009

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