how to read a text file as datetime input?

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Hi everyone,
I have a text file with tiem date format YYYY-MM-DD HH:MM:SS. I want to load it and convert it to datenum. Here is what i attempt so far. (data attached)
cd_ev=readmatrix('tt.txt'); % file attached
%Or
t = load('tt.txt','InputFormat','yyyy-mm-dd HH:mm:ss')
%or
rr=readtable('tt.txt', 'Format','yyyy_mm_dd/dd hh:mm:ss');
None of the above serve fro my purpsoe.

Accepted Answer

Walter Roberson
Walter Roberson on 14 Oct 2022
filename = 'https://www.mathworks.com/matlabcentral/answers/uploaded_files/1156138/tt.txt';
t1 = readtable(filename, 'ReadVariableNames', false);
t1.Properties.VariableNames{1} = 'Date';
t1.Date.Format = 'yyyy_MM_dd/dd HH:mm:ss'; %MM for month, HH for 24 hour hour
%verify
t1.Date(1:5)
ans = 5×1 datetime array
2015_07_10/10 04:43:53 2015_07_18/18 02:57:26 2015_07_27/27 04:59:29 2015_07_27/27 22:15:44 2015_09_13/13 08:23:58
I am having trouble thinking of a good reason to repeat the day like you asked to.
  7 Comments
Walter Roberson
Walter Roberson on 14 Oct 2022
addtodate is specifically designed to only accept scalar datenum. b=cand_ev(:,jj); selected a vector of datenum entries, so addtodate(b) failed.

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