i want to set time when i plot graph in gui

when i put

           09:12:45 ->Edit text 1
           12:00:12 ->Edit text 2

i want to plot graph between text 1 and text 2 time

is it possible?

 handles.fileName=uigetfile('*.xls');
 fileName=handles.fileName;
 [~,txt,~]=xlsread(fileName,'C27:C30000');   
 [Ch1,~,~]=xlsread(fileName,'E27:E30000');
 [Ch2,~,~]=xlsread(fileName,'F27:F30000');
 [Ch3,~,~]=xlsread(fileName,'G27:G30000');
 [Ch4,~,~]=xlsread(fileName,'H27:H30000');
 [Ch5,~,~]=xlsread(fileName,'I27:I30000');
 [Ch6,~,~]=xlsread(fileName,'J27:J30000');
 [Ch7,~,~]=xlsread(fileName,'K27:K30000');
 [Ch8,~,~]=xlsread(fileName,'L27:L30000');
 [Ch9,~,~]=xlsread(fileName,'M27:M30000');
 [Ch10,~,~]=xlsread(fileName,'N27:N30000');
 [Ch11,~,~]=xlsread(fileName,'O27:O30000');
 [Ch12,~,~]=xlsread(fileName,'P27:P30000'); 
 [Ch13,~,~]=xlsread(fileName,'Q27:Q30000');
 [Ch14,~,~]=xlsread(fileName,'R27:R30000');
 [Ch15,~,~]=xlsread(fileName,'S27:S30000');
 [Ch16,~,~]=xlsread(fileName,'T27:T30000');
 [Ch17,~,~]=xlsread(fileName,'U27:U30000');
 [Ch18,~,~]=xlsread(fileName,'V27:V30000');
 [Ch19,~,~]=xlsread(fileName,'W27:W30000');
 [Ch20,~,~]=xlsread(fileName,'X27:X30000');
 char(txt);   %txt is time 
 DateNumber=datenum(txt);
 Date=datetime(DateNumber,'ConvertFrom', 'excel');  
 Date1=datetime(Date,'Format','hh:mm:ss');