Intraday stock candestick X-axes problems

Hi, as you can see from the title I would like to plot hourly stock prices as candlestick. The problem is the X-axes, I have no idea how to treat the dates.

If I use the basic formula:

    % candle(H(end-100:end),L(end-100:end),LP(end-100:end),O(end-100:end));

I get a very nice candle chart but the X-ax is just a serial number (First subplot)

while if I use

    % candle(H(end-100:end),L(end-100:end),LP(end-100:end),O(end-100:end),     [],date(end-100:end,1));

where the variable date come from the following code

    [filename,pathname]=uigetfile('*.xlsx');
    [prices, textdata, raw]=xlsread(filename,1);
     date=textdata(2:end,1);

it gives the error

*??? Error using ==> set Value must be numeric

Error in ==> candle at 138 set(hcdl_vl, 'XData', dateset(line_xdata));

Error in ==> TSprova at 96 candle(H(end-100:end),L(end-100:end),LP(end-100:end),O(end-100:end),[],date(end-100:end,1));*

So I tried trasformung the data in using datenum, but I get blank space for nontrading hours and WE.

Of course I'm not an expert of Matlab but I want to learn and try to use it in a trading system. I would apreciate any suggestion.