% [psd,t,f]=single_fft12(ws10,10,rectwin(18000),.5,20,0);
% pcolor(t,log10(f),(psd))
%     i=10:10:100;
%     t1=9000:9000:9000*103;
%     t2=t1(i);
%     t2=t2./10;
    ticks_num = get(gca,'XTick');
    N=datenum(2004,9,5,0,0,0+ticks_num');
    d2=datestr(N,15);
    ticks_num = get(gca,'XTick');
    set(gca,'XTickLabel','')
    set(gca,'XTickLabel',d2)
    