Error using second . Invalid date/time class. (I am working on guide)

I am trying to record time everytime the mouse cursor crosses a certain region but i am experiencing issues.

function varargout = Hapticfinal(varargin)
% HAPTICFINAL MATLAB code for Hapticfinal.fig
%      HAPTICFINAL, by itself, creates a new HAPTICFINAL or raises the existing
%      singleton*.
%
%      H = HAPTICFINAL returns the handle to a new HAPTICFINAL or the handle to
%      the existing singleton*.
%
%      HAPTICFINAL('CALLBACK',hObject,eventData,handles,...) calls the local
%      function named CALLBACK in HAPTICFINAL.M with the given input arguments.
%
%      HAPTICFINAL('Property','Value',...) creates a new HAPTICFINAL or raises the
%      existing singleton*.  Starting from the left, property value pairs are
%      handleslied to the GUI before Hapticfinal_OpeningFcn gets called.  An
%      unrecognized property name or invalid value makes property handleslication
%      stop.  All inputs are passed to Hapticfinal_OpeningFcn via varargin.
%
%      *See GUI Options on GUIDE's Tools menu.  Choose "GUI allows only one
%      instance to run (singleton)".
%
% See also: GUIDE, GUIDATA, GUIHANDLES

% Edit the above text to modify the response to help Hapticfinal

% Last Modified by GUIDE v2.5 17-Feb-2022 21:51:18

% Begin initialization code - DO NOT EDIT
gui_Singleton = 1;
gui_State = struct('gui_Name',       mfilename, ...
                   'gui_Singleton',  gui_Singleton, ...
                   'gui_OpeningFcn', @Hapticfinal_OpeningFcn, ...
                   'gui_OutputFcn',  @Hapticfinal_OutputFcn, ...
                   'gui_LayoutFcn',  [] , ...
                   'gui_Callback',   []);
if nargin && ischar(varargin{1})
    gui_State.gui_Callback = str2func(varargin{1});
end

if nargout
    [varargout{1:nargout}] = gui_mainfcn(gui_State, varargin{:});
else
    gui_mainfcn(gui_State, varargin{:});
end
% End initialization code - DO NOT EDIT


% --- Executes just before Hapticfinal is made visible.
function Hapticfinal_OpeningFcn(hObject, eventdata, handles, varargin)
% This function has no output args, see OutputFcn.
% hObject    handle to figure
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
% varargin   command line arguments to Hapticfinal (see VARARGIN)

% Choose default command line output for Hapticfinal
handles.output = hObject;

            
            % Plot patch on uiaxes
            %hold on
            
            % Read experiment data from a CSV file
            
            load_folder = "C:\Users\Hp\Desktop\thesis\excel_data\";
            load_name   = "excel_data.xlsx";
            load_addr   = load_folder + load_name;
            
            handles.T = readtable(load_addr,'NumHeaderLines',1);
            
            handles.exp_counter = 1;

            handles.v_thickness_1   = handles.T.Var1;
            handles.v_thickness_2   = handles.T.Var2;
            handles.h_thickness_1   = handles.T.Var3;
            handles.h_thickness_2   = handles.T.Var4;
            handles.amplitude_array = handles.T.Var5;
            handles.v_or_h_array    = handles.T.Var6;
            
           handles.v_thick1 = handles.v_thickness_1(handles.exp_counter);
           handles.v_thick2 = handles.v_thickness_2(handles.exp_counter);
            
           handles.h_thick1 = handles.h_thickness_1(handles.exp_counter);
           handles.h_thick2 = handles.h_thickness_2(handles.exp_counter);

            
           handles.v_or_h = handles.v_or_h_array(handles.exp_counter);
            
          handles.region1 = [];
%           
%            % Create the Arduino serial object
%             handles.arduinoObj = serialport("COM6", 9600);
%             configureTerminator(handles.arduinoObj,"CR/LF");
%             %flush(handles.arduinoObj);
%             % 
%             for i=1:8 
%                 handles.message = readline(handles.arduinoObj);
%                 disp(handles.message)
%             end

          create_patch(handles);
          
% Update handles structure
%guidata(hObject, handles);

% UIWAIT makes Hapticfinal wait for user response (see UIRESUME)
% uiwait(handles.finger);

function create_patch(handles)
if ishandle(handles.region1)
    delete(handles.region1);
end
 v_or_h = handles.v_or_h_array(handles.exp_counter);
if v_or_h == 0 % Vertical line
    v_thick1 = handles.v_thickness_1(handles.exp_counter);
    v_thick2 = handles.v_thickness_2(handles.exp_counter);
    handles.region1 = patch( ...
        'Parent',handles.axes1, ...
        'XData',[v_thick1 v_thick2 v_thick2 v_thick1], ...
        'YData',[-10 -10 10 10], ...
        'FaceColor','red');
    set(handles.axes1,'XLim',[-5 0],'YLim',[-10 10]);
else % Horizontal line
    h_thick1 = handles.h_thickness_1(handles.exp_counter);
    h_thick2 = handles.h_thickness_2(handles.exp_counter);
    handles.region1 = patch( ...
        'Parent',handles.axes1, ...
        'XData',[-10 10 10 -10], ...
        'YData',[h_thick1 h_thick1 h_thick2 h_thick2], ...
        'FaceColor','red');
    set(handles.axes1,'XLim',[0 5],'XLim',[-10 10]);
end
set(handles.axes1,'XGrid','on','YGrid','on');
axis(handles.axes1,'equal');
% Update handles structure
guidata(handles.finger,handles);
% call the button motion fcn to update the new patch's color:
finger_WindowButtonMotionFcn(handles.finger);



% --- Outputs from this function are returned to the command line.
function varargout = Hapticfinal_OutputFcn(hObject, eventdata, handles) 
% varargout  cell array for returning output args (see VARARGOUT);
% hObject    handle to figure
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

% Get default command line output from handles structure
varargout{1} = handles.output;


% --- Executes on mouse motion over figure - except title and menu.
function finger_WindowButtonMotionFcn(hObject,~, handles)
% hObject    handle to finger (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
handles = guidata(hObject);
pos = get(hObject, 'currentpoint'); % get mouse location on figure
global x;
global y;
x = pos(1); 
y = pos(2); % assign locations to x and y
set(handles.xloc, 'string', ['x loc:' num2str(x)]); % update text for x loc
set(handles.yloc, 'string', ['y loc:' num2str(y)]); % update text for y loc 

% Determine if mouse is within the region

p_x = get(handles.region1,'XData');
p_x = p_x([1 2]);
p_y = get(handles.region1,'YData');
p_y = p_y([1 3]);

ax_xl = get(handles.axes1,'XLim');
ax_yl = get(handles.axes1,'YLim');

ax_units = get(handles.axes1,'Units');
if ~strcmp(ax_units,'pixels')
    set(handles.axes1,'Units','pixels')
end
ax_pos = get(handles.axes1,'Position'); % axes1 position in pixels
if ~strcmp(ax_units,'pixels')
    set(handles.axes1,'Units',ax_units);
end

% convert the patch XData and YData from axes coordinates to figure coordinates in pixels
p_x = (p_x-ax_xl(1))/(ax_xl(2)-ax_xl(1))*ax_pos(3)+ax_pos(1);
p_y = (p_y-ax_yl(1))/(ax_yl(2)-ax_yl(1))*ax_pos(4)+ax_pos(2);

 persistent timein

if x >= p_x(1) && x <= p_x(2) && y >= p_y(1) && y <= p_y(2)
            timein = datetime('now');
    set(handles.region1,'FaceColor','g');
    %writeline(handles.arduinoObj, "4&MOTOR_1_2_3_4&0!");
else
            timeInPatch = second(datetime('now')-timein);              %%THE iSSUE SEEMS TO COME FROM THIS LINE
            ax = ancestor(handles.region1, 'axes');
            cp = ax.CurrentPoint;
            text(ax, 0.52, cp(1,2), sprintf('%.3f sec.', timeInPatch), ...
                'HorizontalAlignment','Left', ...
                'VerticalAlignment','bottom', ...
                'FontSize', 12, ...
                'FontWeight', 'bold', ...
                'Color', 'b')
    set(handles.region1,'FaceColor','r');
    %writeline(handles.arduinoObj, "0&MOTOR_1_2_3_4&0!");
end
 
 % Create the Arduino serial object
            %handles.arduinoObj = serialport("COM3", 9600);
            %configureTerminator(handles.arduinoObj,"CR/LF");
            %flush(handles.arduinoObj);
            % 
            %%for i=1:8 
                %handles.message = readline(handles.arduinoObj);
                %disp(handles.message)
            %end
        
% --- Executes on button press in Start_button.
%function Start_button_Callback(hObject, eventdata, handles)
% --- Executes on button press in Start_button.
function Start_button_Callback(hObject, eventdata, handles)
% hObject    handle to Start_button (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
%clear
%clc
handles.fileID = fopen('exp.txt','w');
handles.t = timer('ExecutionMode', 'fixedRate', ...
          'Period', 0.5, ...
          'TasksToExecute', Inf, ... 
          'TimerFcn', {@timerCallback, handles.fileID});
start(handles.t);
set(handles.Start_button,'Enable','off'); % -> Disable the button
guidata(hObject,handles);% -----> do this to save the updated handles object
function timerCallback(~,~,fileID)
fprintf(fileID,'(X, Y, time) = (%g, %g, %s)\n', get(0, 'PointerLocation'), datetime('now'));
fprintf('calling timer callback\n');


% --- Executes on button press in Stop_button.
function Stop_button_Callback(hObject, eventdata, handles)
% hObject    handle to Stop_button (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
handles = guidata(hObject);
stop(handles.t) %whenever we want to stop.
fclose(handles.fileID);
set(handles.Start_button,'Enable','on'); % -> Enable the button
guidata(hObject,handles);





% --- Executes on button press in Yes_button.
function Yes_button_Callback(hObject, eventdata, handles)
% hObject    handle to Yes_button (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
answer = questdlg('ARE YOU SURE?','Confirm close',...
                'OK',@(src,event)mycallback(handles,src,event));
            clear
            clc
            fileID= fopen('exp.txt2','a');
            YES = "I FEEL IT";
            fprintf (fileID, "%s\n",YES);
            fclose(fileID);
         



% --- Executes on button press in NO_button.
function NO_button_Callback(hObject, ~, handles)
% hObject    handle to NO_button (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA) 
answer1= questdlg('ARE YOU SURE?','Confirm Close',...
                'OK',@(src,event)mycallback(handles,src,event));
            clear
            clc
            fileID= fopen('exp.txt2','a');
            NO = "I DON'T FEEL IT";
            fprintf (fileID, "%s\n",NO);
            fclose(fileID);



% --- Executes on button press in Next_button.
function Next_button_Callback(hObject, eventdata, handles)
% hObject    handle to Next_button (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)uiconfirm(handles.UIFigure,'Are You sure?','Confirm Close',...
handles = guidata(hObject);
f = msgbox('Operation Completed','NEXT');
            % Read experiment data from a CSV file
            
           % region1 = patch(axes1,[-10 10 10 -10],[-5 -5 -4.4 -4.4],'r','FaceAlpha',1,...
              %'LineWidth',0.01,'LineStyle','-','tag','region1');
           handles.exp_counter = handles.exp_counter + 1;

if handles.exp_counter > numel(handles.v_thickness_1)
    return
    
end

  %if ishandle(handles.region1)
                %delete(handles.region1);
  %end

% delete the old patch and create a new one:
create_patch(handles);
          
           % Create the Arduino serial object
           % handles.arduinoObj = serialport("COM3", 9600);
            %configureTerminator(handles.arduinoObj,"CR/LF");
            %flush(arduinoObj);
            % 
            %for i=1:8 
              % message = readline(arduinoObj);
              %disp(message)
            %end
            
       
            
      
 

% --- Executes on button press in pushbutton7.
function pushbutton7_Callback(hObject, eventdata, handles)
% hObject    handle to pushbutton7 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)


% --- Executes during object creation, after setting all properties.
function finger_CreateFcn(hObject, eventdata, handles)
% hObject    handle to finger (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    empty - handles not created until after all CreateFcns called

[Jan]

"i am experiencing issues" - it would be useful if you mention any details. Post the complete error message, such that the readers do not have to guess, which line is failing.

[Franck paulin Ludovig pehn Mayo]

@Jan my bad on that. Below is the complete errors message.

>> Hapticfinal
Error using second (line 49)
Invalid date/time class.

Error in Hapticfinal>finger_WindowButtonMotionFcn (line 196)
            timeInPatch = second(datetime('now')-timein);

Error in gui_mainfcn (line 95)
        feval(varargin{:});

Error in Hapticfinal (line 42)
    gui_mainfcn(gui_State, varargin{:});

Error in
matlab.graphics.internal.figfile.FigFile/read>@(hObject,eventdata)Hapticfinal('finger_WindowButtonMotionFcn',hObject,eventdata,guidata(hObject))
 
Error while evaluating Figure WindowButtonMotionFcn.

Error using second (line 49)
Invalid date/time class.

Error in Hapticfinal>finger_WindowButtonMotionFcn (line 196)
            timeInPatch = second(datetime('now')-timein);

Error in gui_mainfcn (line 95)
        feval(varargin{:});

Error in Hapticfinal (line 42)
    gui_mainfcn(gui_State, varargin{:});

Error in
matlab.graphics.internal.figfile.FigFile/read>@(hObject,eventdata)Hapticfinal('finger_WindowButtonMotionFcn',hObject,eventdata,guidata(hObject))
 
Error while evaluating Figure WindowButtonMotionFcn.

Error using second (line 49)
Invalid date/time class.

Error in Hapticfinal>finger_WindowButtonMotionFcn (line 196)
            timeInPatch = second(datetime('now')-timein);

Error in gui_mainfcn (line 95)
        feval(varargin{:});

Error in Hapticfinal (line 42)
    gui_mainfcn(gui_State, varargin{:});

Error in
matlab.graphics.internal.figfile.FigFile/read>@(hObject,eventdata)Hapticfinal('finger_WindowButtonMotionFcn',hObject,eventdata,guidata(hObject))
 
Error while evaluating Figure WindowButtonMotionFcn.

Error using second (line 49)
Invalid date/time class.

Error in Hapticfinal>finger_WindowButtonMotionFcn (line 196)
            timeInPatch = second(datetime('now')-timein);

Error in gui_mainfcn (line 95)
        feval(varargin{:});

Error in Hapticfinal (line 42)
    gui_mainfcn(gui_State, varargin{:});

Error in
matlab.graphics.internal.figfile.FigFile/read>@(hObject,eventdata)Hapticfinal('finger_WindowButtonMotionFcn',hObject,eventdata,guidata(hObject))
 
Error while evaluating Figure WindowButtonMotionFcn.

Error using second (line 49)
Invalid date/time class.

Error in Hapticfinal>finger_WindowButtonMotionFcn (line 196)
            timeInPatch = second(datetime('now')-timein);

Error in gui_mainfcn (line 95)
        feval(varargin{:});

Error in Hapticfinal (line 42)
    gui_mainfcn(gui_State, varargin{:});

Error in
matlab.graphics.internal.figfile.FigFile/read>@(hObject,eventdata)Hapticfinal('finger_WindowButtonMotionFcn',hObject,eventdata,guidata(hObject))
 
Error while evaluating Figure WindowButtonMotionFcn.

Error using second (line 49)
Invalid date/time class.

Error in Hapticfinal>finger_WindowButtonMotionFcn (line 196)
            timeInPatch = second(datetime('now')-timein);

Error in gui_mainfcn (line 95)
        feval(varargin{:});

Error in Hapticfinal (line 42)
    gui_mainfcn(gui_State, varargin{:});

Error in
matlab.graphics.internal.figfile.FigFile/read>@(hObject,eventdata)Hapticfinal('finger_WindowButtonMotionFcn',hObject,eventdata,guidata(hObject))
 
Error while evaluating Figure WindowButtonMotionFcn.

Error using second (line 49)
Invalid date/time class.

Error in Hapticfinal>finger_WindowButtonMotionFcn (line 196)
            timeInPatch = second(datetime('now')-timein);

Error in gui_mainfcn (line 95)
        feval(varargin{:});

Error in Hapticfinal (line 42)
    gui_mainfcn(gui_State, varargin{:});

Error in
matlab.graphics.internal.figfile.FigFile/read>@(hObject,eventdata)Hapticfinal('finger_WindowButtonMotionFcn',hObject,eventdata,guidata(hObject))
 
Error while evaluating Figure WindowButtonMotionFcn.

Error using second (line 49)
Invalid date/time class.

Error in Hapticfinal>finger_WindowButtonMotionFcn (line 196)
            timeInPatch = second(datetime('now')-timein);

Error in gui_mainfcn (line 95)
        feval(varargin{:});

Error in Hapticfinal (line 42)
    gui_mainfcn(gui_State, varargin{:});

Error in
matlab.graphics.internal.figfile.FigFile/read>@(hObject,eventdata)Hapticfinal('finger_WindowButtonMotionFcn',hObject,eventdata,guidata(hObject))
 
Error while evaluating Figure WindowButtonMotionFcn.

Error using second (line 49)
Invalid date/time class.

Error in Hapticfinal>finger_WindowButtonMotionFcn (line 196)
            timeInPatch = second(datetime('now')-timein);

Error in gui_mainfcn (line 95)
        feval(varargin{:});

Error in Hapticfinal (line 42)
    gui_mainfcn(gui_State, varargin{:});

Error in
matlab.graphics.internal.figfile.FigFile/read>@(hObject,eventdata)Hapticfinal('finger_WindowButtonMotionFcn',hObject,eventdata,guidata(hObject))
 
Error while evaluating Figure WindowButtonMotionFcn.

Error using second (line 49)
Invalid date/time class.

Error in Hapticfinal>finger_WindowButtonMotionFcn (line 196)
            timeInPatch = second(datetime('now')-timein);

Error in gui_mainfcn (line 95)
        feval(varargin{:});

Error in Hapticfinal (line 42)
    gui_mainfcn(gui_State, varargin{:});

Error in
matlab.graphics.internal.figfile.FigFile/read>@(hObject,eventdata)Hapticfinal('finger_WindowButtonMotionFcn',hObject,eventdata,guidata(hObject))
 
Error while evaluating Figure WindowButtonMotionFcn.

Error using second (line 49)
Invalid date/time class.

Error in Hapticfinal>finger_WindowButtonMotionFcn (line 196)
            timeInPatch = second(datetime('now')-timein);

Error in gui_mainfcn (line 95)
        feval(varargin{:});

Error in Hapticfinal (line 42)
    gui_mainfcn(gui_State, varargin{:});

Error in
matlab.graphics.internal.figfile.FigFile/read>@(hObject,eventdata)Hapticfinal('finger_WindowButtonMotionFcn',hObject,eventdata,guidata(hObject))
 
Error while evaluating Figure WindowButtonMotionFcn.

Error using second (line 49)
Invalid date/time class.

Error in Hapticfinal>finger_WindowButtonMotionFcn (line 196)
            timeInPatch = second(datetime('now')-timein);

Error in gui_mainfcn (line 95)
        feval(varargin{:});

Error in Hapticfinal (line 42)
    gui_mainfcn(gui_State, varargin{:});

Error in
matlab.graphics.internal.figfile.FigFile/read>@(hObject,eventdata)Hapticfinal('finger_WindowButtonMotionFcn',hObject,eventdata,guidata(hObject))
 
Error while evaluating Figure WindowButtonMotionFcn.

Error using second (line 49)
Invalid date/time class.

Error in Hapticfinal>finger_WindowButtonMotionFcn (line 196)
            timeInPatch = second(datetime('now')-timein);

Error in gui_mainfcn (line 95)
        feval(varargin{:});

Error in Hapticfinal (line 42)
    gui_mainfcn(gui_State, varargin{:});

Error in
matlab.graphics.internal.figfile.FigFile/read>@(hObject,eventdata)Hapticfinal('finger_WindowButtonMotionFcn',hObject,eventdata,guidata(hObject))
 
Error while evaluating Figure WindowButtonMotionFcn.

Error using second (line 49)
Invalid date/time class.

Error in Hapticfinal>finger_WindowButtonMotionFcn (line 196)
            timeInPatch = second(datetime('now')-timein);

Error in gui_mainfcn (line 95)
        feval(varargin{:});

Error in Hapticfinal (line 42)
    gui_mainfcn(gui_State, varargin{:});

Error in
matlab.graphics.internal.figfile.FigFile/read>@(hObject,eventdata)Hapticfinal('finger_WindowButtonMotionFcn',hObject,eventdata,guidata(hObject))
 
Error while evaluating Figure WindowButtonMotionFcn.

Error using second (line 49)
Invalid date/time class.

Error in Hapticfinal>finger_WindowButtonMotionFcn (line 196)
            timeInPatch = second(datetime('now')-timein);

Error in gui_mainfcn (line 95)
        feval(varargin{:});

Error in Hapticfinal (line 42)
    gui_mainfcn(gui_State, varargin{:});

Error in
matlab.graphics.internal.figfile.FigFile/read>@(hObject,eventdata)Hapticfinal('finger_WindowButtonMotionFcn',hObject,eventdata,guidata(hObject))
 
Error while evaluating Figure WindowButtonMotionFcn.

Error using second (line 49)
Invalid date/time class.

Error in Hapticfinal>finger_WindowButtonMotionFcn (line 196)
            timeInPatch = second(datetime('now')-timein);

Error in gui_mainfcn (line 95)
        feval(varargin{:});

Error in Hapticfinal (line 42)
    gui_mainfcn(gui_State, varargin{:});

Error in
matlab.graphics.internal.figfile.FigFile/read>@(hObject,eventdata)Hapticfinal('finger_WindowButtonMotionFcn',hObject,eventdata,guidata(hObject))
 
Error while evaluating Figure WindowButtonMotionFcn.

Error using second (line 49)
Invalid date/time class.

Error in Hapticfinal>finger_WindowButtonMotionFcn (line 196)
            timeInPatch = second(datetime('now')-timein);

Error in gui_mainfcn (line 95)
        feval(varargin{:});

Error in Hapticfinal (line 42)
    gui_mainfcn(gui_State, varargin{:});

Error in
matlab.graphics.internal.figfile.FigFile/read>@(hObject,eventdata)Hapticfinal('finger_WindowButtonMotionFcn',hObject,eventdata,guidata(hObject))
 
Error while evaluating Figure WindowButtonMotionFcn.

Error using second (line 49)
Invalid date/time class.

Error in Hapticfinal>finger_WindowButtonMotionFcn (line 196)
            timeInPatch = second(datetime('now')-timein);

Error in gui_mainfcn (line 95)
        feval(varargin{:});

Error in Hapticfinal (line 42)
    gui_mainfcn(gui_State, varargin{:});

Error in
matlab.graphics.internal.figfile.FigFile/read>@(hObject,eventdata)Hapticfinal('finger_WindowButtonMotionFcn',hObject,eventdata,guidata(hObject))
 
Error while evaluating Figure WindowButtonMotionFcn.

Error using second (line 49)
Invalid date/time class.

Error in Hapticfinal>finger_WindowButtonMotionFcn (line 196)
            timeInPatch = second(datetime('now')-timein);

Error in gui_mainfcn (line 95)
        feval(varargin{:});

Error in Hapticfinal (line 42)
    gui_mainfcn(gui_State, varargin{:});

Error in
matlab.graphics.internal.figfile.FigFile/read>@(hObject,eventdata)Hapticfinal('finger_WindowButtonMotionFcn',hObject,eventdata,guidata(hObject))
 
Error while evaluating Figure WindowButtonMotionFcn.

Error using second (line 49)
Invalid date/time class.

Error in Hapticfinal>finger_WindowButtonMotionFcn (line 196)
            timeInPatch = second(datetime('now')-timein);

Error in gui_mainfcn (line 95)
        feval(varargin{:});

Error in Hapticfinal (line 42)
    gui_mainfcn(gui_State, varargin{:});

Error in
matlab.graphics.internal.figfile.FigFile/read>@(hObject,eventdata)Hapticfinal('finger_WindowButtonMotionFcn',hObject,eventdata,guidata(hObject))
 
Error while evaluating Figure WindowButtonMotionFcn.

Error using second (line 49)
Invalid date/time class.

Error in Hapticfinal>finger_WindowButtonMotionFcn (line 196)
            timeInPatch = second(datetime('now')-timein);

Error in gui_mainfcn (line 95)
        feval(varargin{:});

Error in Hapticfinal (line 42)
    gui_mainfcn(gui_State, varargin{:});

Error in
matlab.graphics.internal.figfile.FigFile/read>@(hObject,eventdata)Hapticfinal('finger_WindowButtonMotionFcn',hObject,eventdata,guidata(hObject))
 
Error while evaluating Figure WindowButtonMotionFcn.

Error using second (line 49)
Invalid date/time class.

Error in Hapticfinal>finger_WindowButtonMotionFcn (line 196)
            timeInPatch = second(datetime('now')-timein);

Error in gui_mainfcn (line 95)
        feval(varargin{:});

Error in Hapticfinal (line 42)
    gui_mainfcn(gui_State, varargin{:});

Error in
matlab.graphics.internal.figfile.FigFile/read>@(hObject,eventdata)Hapticfinal('finger_WindowButtonMotionFcn',hObject,eventdata,guidata(hObject))
 
Error while evaluating Figure WindowButtonMotionFcn.

Error using second (line 49)
Invalid date/time class.

Error in Hapticfinal>finger_WindowButtonMotionFcn (line 196)
            timeInPatch = second(datetime('now')-timein);

Error in gui_mainfcn (line 95)
        feval(varargin{:});

Error in Hapticfinal (line 42)
    gui_mainfcn(gui_State, varargin{:});

Error in
matlab.graphics.internal.figfile.FigFile/read>@(hObject,eventdata)Hapticfinal('finger_WindowButtonMotionFcn',hObject,eventdata,guidata(hObject))
 
Error while evaluating Figure WindowButtonMotionFcn.

Error using second (line 49)
Invalid date/time class.

Error in Hapticfinal>finger_WindowButtonMotionFcn (line 196)
            timeInPatch = second(datetime('now')-timein);

Error in gui_mainfcn (line 95)
        feval(varargin{:});

Error in Hapticfinal (line 42)
    gui_mainfcn(gui_State, varargin{:});

Error in
matlab.graphics.internal.figfile.FigFile/read>@(hObject,eventdata)Hapticfinal('finger_WindowButtonMotionFcn',hObject,eventdata,guidata(hObject))
 
Error while evaluating Figure WindowButtonMotionFcn.

Error using second (line 49)
Invalid date/time class.

Error in Hapticfinal>finger_WindowButtonMotionFcn (line 196)
            timeInPatch = second(datetime('now')-timein);

Error in gui_mainfcn (line 95)
        feval(varargin{:});

Error in Hapticfinal (line 42)
    gui_mainfcn(gui_State, varargin{:});

Error in
matlab.graphics.internal.figfile.FigFile/read>@(hObject,eventdata)Hapticfinal('finger_WindowButtonMotionFcn',hObject,eventdata,guidata(hObject))
 
Error while evaluating Figure WindowButtonMotionFcn.

Error using second (line 49)
Invalid date/time class.

Error in Hapticfinal>finger_WindowButtonMotionFcn (line 196)
            timeInPatch = second(datetime('now')-timein);

Error in gui_mainfcn (line 95)
        feval(varargin{:});

Error in Hapticfinal (line 42)
    gui_mainfcn(gui_State, varargin{:});

Error in
matlab.graphics.internal.figfile.FigFile/read>@(hObject,eventdata)Hapticfinal('finger_WindowButtonMotionFcn',hObject,eventdata,guidata(hObject))
 
Error while evaluating Figure WindowButtonMotionFcn.

Error using second (line 49)
Invalid date/time class.

Error in Hapticfinal>finger_WindowButtonMotionFcn (line 196)
            timeInPatch = second(datetime('now')-timein);

Error in gui_mainfcn (line 95)
        feval(varargin{:});

Error in Hapticfinal (line 42)
    gui_mainfcn(gui_State, varargin{:});

Error in
matlab.graphics.internal.figfile.FigFile/read>@(hObject,eventdata)Hapticfinal('finger_WindowButtonMotionFcn',hObject,eventdata,guidata(hObject))
 
Error while evaluating Figure WindowButtonMotionFcn.

Error using second (line 49)
Invalid date/time class.

Error in Hapticfinal>finger_WindowButtonMotionFcn (line 196)
            timeInPatch = second(datetime('now')-timein);

Error in gui_mainfcn (line 95)
        feval(varargin{:});

Error in Hapticfinal (line 42)
    gui_mainfcn(gui_State, varargin{:});

Error in
matlab.graphics.internal.figfile.FigFile/read>@(hObject,eventdata)Hapticfinal('finger_WindowButtonMotionFcn',hObject,eventdata,guidata(hObject))
 
Error while evaluating Figure WindowButtonMotionFcn.

>> 

[Jan]

:-) This is a pile of error message. The first one would be enough.

[Franck paulin Ludovig pehn Mayo]

@Jan yeah...My mistake was not to mention that i commented the error in the code i posted first.

Answer 1

[Jan]

A bold guess:

persistent timein
if x >= p_x(1) && x <= p_x(2) && y >= p_y(1) && y <= p_y(2)
    timein = datetime('now');
    set(handles.region1,'FaceColor','g');
else
    timeInPatch = second(datetime('now')-timein);    

When this function runs the first time and x or y are outside the range defined in the if condition, the value or timein is the empty matrix. datetime('now')-[] is not defined and therefore seconds() cannot work.

What should the value of timein be, if the former condition was not met before? Maybe:

persistent timein;
if isempty(timein)
   timein = datetime('now');
end
if x >= ...

[Franck paulin Ludovig pehn Mayo]

@Jan thank you. However, i am still facing the same issue.

[Jan]

@Franck paulin Ludovig pehn M: Now please mention, what "still" means. I just guessed, what you want to do instead. So was this guess correct? did you insert my suggestion in your code? And you still get the same error? I cannot imagine this, but if this is the case, use the debugger to find the problem. Type this in the command window:

dbstop if error

Now run the code again. When it stops at the failing line, check the arguments used in this line. Now you see, what the problem is. Of course, this does not automatically reveal a solution, but you are on the best way.

If you explain, what you want to do, the readers can suggest some code to implement it.

[Franck paulin Ludovig pehn Mayo]

@Jan Yes, you got the issue."still" means that i have implemented the code you suggested but i am having the same error lines.

Using "dbstop if error" gave me the following outputs. Wow, it is the first time i am hearing about this command.

function s = second(d,f)

[SL: snipped the remainder of the second.m that I believe came from Financial Toolbox. Please don't post the entirety of MathWorks written functions.]

[Rik]

The point is this:

You want to execute timeInPatch = second(datetime('now')-timein);. Unless you really messed things up by defining a variable or custom function with the name datetime, the problem will not be there. It probably is when the output of datetime interacts with timein.

With the dbstop command you have started the debugger. Now you need to find out the value and class of timein at the time of the error. Then you can execute datetime('now')-timein in the command window to see if that matches your expectations.

[Franck paulin Ludovig pehn Mayo]

@Rik actually , using seconds (with " s") solve the error....But the output it is not what i was expecting. I only want to have the "time in " whenever i cross the region.

See attached file to see the issues.

Answer 2

[Stephen23]

Subtracting a DATETIME object from a DATETIME object, as you do on that line, returns a DURATION object.

However the function SECOND is defined for DATETIME objects only. Thus the error.

The solution is to use SECONDS, which is defined for DURATION objects.

[Franck paulin Ludovig pehn Mayo]

@Stephen it worked partially (I am not longer having errors in the command window).... When i was expecting is a lil bit far from the outputs now. See attached...the outputs is all vertical even though i am crossing the region.

I would like just to record the time in seconds whenever i am crossing the region.

[Franck paulin Ludovig pehn Mayo]

@Adam Danz I am trying to reproduce what you did last year in guide instead of appdesigner see link below.(Show sampling interval). Unfortunateley, i am having another output. see attached please

https://in.mathworks.com/matlabcentral/answers/1614760-appdesigner-gui-issue-code