How to convert from matlab time to reall time and date

I have

datestr(7.3684e+05)

ans =

    '25-May-2017'
    
    

But I need the time and seconds aswell, How do I get this ?

whith this information - I am trying to combine this with [x y]=ginput, as I want to take the times off a graph.

I have tried using

datetick('x', 'dd/mm - HH:MM', 'keepticks', 'keeplimits'); and datetick('x')

Any advise would be appreciated as I am not following the help pages for this problem

Answer 1

[Stephan]

datestr(7.3684e+05,'dd-mmmm-yyyy HH:MM:SS')

ans =

    '25-May-2017 00:00:00' 

or with some content in it:

>> datestr(7.3684e+05+13.42,'dd-mmmm-yyyy HH:MM:SS')

ans =

    '07-June-2017 10:04:48'

Best regards

Stephan

[Rebecca Ellis]

Thank you for your reply - as it is rounded I get all my values as 7.3684e+05 with ginput - how would I get the points without rounding them as this is important in the time conversion. I am using [x y]=ginput. see exaple attached

[Stephan]

Hi,

this seems to work:

% Some data to play with
t1 = datetime('2018-01-01 12:00:00');
t2 = datetime('2018-01-18 06:00:00');
t = t1:days:t2;
val = randi(10,1,numel(t));

%Show figure
fig = figure(1);
plot(t,val)

% Get 5 Points
[x,y] = ginput(5);

% Calculate the picked dates with time
date_x = x(:)+t1;

In my tests i got results which seem to be correct. For example:

date_x = 

  5×1 datetime array

   04-Jan-2018 08:51:13
   04-Jan-2018 20:18:13
   07-Jan-2018 12:03:05
   09-Jan-2018 23:28:01
   11-Jan-2018 05:29:03

[Rebecca Ellis]

I am getting :

'15-Oct-4034 01:40:08'
'15-Oct-4034 13:40:38'
'15-Oct-4034 01:59:33'
'15-Oct-4034 13:47:54'

But they should be all 23rd/24th of may 2017

When I follow:

% t1 = datetime('23-May-2017 09:15:00');
%change format to :
  t1 = datetime('2017-05-23 09:15:00');
% Get 5 Points
[x,y] = ginput(4);
% Calculate the picked dates with time
date_x = x(:)+t1;

[Rebecca Ellis]

time = datestr(x)

time =

4×20 char array

'23-May-2017 16:25:08'

'24-May-2017 04:25:38'

'23-May-2017 16:44:33'

'24-May-2017 04:32:54'

And it seemed to have worked, thank you for helping me get to here. much appreciated.

Answer 2

[Peter Perkins]

Rebecca, your description is not clear enough to understand what you are trying to do, but unless you are using a fairly old version of MATLAB, you should try to stay away from the old datenum/datestr functions and use datetime instead.