MATLAB: Xlsx reading not taking adate and time

xlsread

z=xlsread('2019_SysLoad.xlsx');
2019_SysLoad has 6 columns with titles
Date Hr_End DA_LMP Dry_Bulb Dew_Point System_Load
if i use the above code , it saves z with only 4 columns,.
First two columns of date and time not getting saved in z .
Can i know how to load date and time as well?