How to compress x-axis with datetime values so that only the times with datapoints are displayed?

Dear all,

I am having issues with plotting data over datetime. The dataset cointains data from the 19.10.2016 11pm UTC - 20.10.2016 08pm UTC. However, plotting the data with

time = datetime(data.Time_UTC, 'InputFormat', 'HH:mm:ss');

date = datetime(data.Date, 'InputFormat', 'dd-MM-yyyy');

Datetime = date + timeofday(time);

figure;

subplot(3,2,1);plot(datenum(Datetime),evap,'.');xlabel('time');ylabel('Evap (mm/h)');grid;datetick('x', 'yyyy-mm-dd')%title(['Ts= ' num2str(ts(1)) ' Ta= ' num2str(t(1)) ' RH= ' num2str(rh(1)) ' Wave Age= ' num2str(Wa(1))]);

subplot(3,2,2);plot(datenum(Datetime),ebulk,'.');xlabel('time');ylabel('Evap (mm/h)');grid;datetick('x', 'yyyy-mm-dd')%title(['Ts= ' num2str(ts(1)) ' Ta= ' num2str(t(1)) ' RH= ' num2str(rh(1)) ' Wave Age= ' num2str(Wa(1))]);

subplot(3,2,3);area(datenum(Datetime),evap_acm);xlabel('time');ylabel('Evap acm (mm)');grid;datetick('x', 'yyyy-mm-dd')

subplot(3,2,4);area(datenum(Datetime),ebulk_acm);xlabel('time');ylabel('Evap acm (mm)');grid;datetick('x', 'yyyy-mm-dd')

subplot(3,2,5);plot(datenum(Datetime),shflux,'.');xlabel('time');ylabel('Sensible Heat Flux (W/m^2)');grid;datetick('x', 'yyyy-mm-dd')

subplot(3,2,6);plot(datenum(Datetime),lhflux,'.');xlabel('time');ylabel('Latent Heat Flux (W/m^2)');grid;datetick('x', 'yyyy-mm-dd')

leads to this:

but I actually want only the Data which actually contains data - can anyone help?

Thanks in advance!!