Clear Filters
Clear Filters

How to account for the day suffix when using datetime to recognise dates in matlab?

2 views (last 30 days)
I have a cell array T containing a column of dates from several events, formatted as follows:
17×1 cell array
{'Mon 14th Oct 2019 8:23:48 am' }
{'Thu 10th Oct 2019 8:00:26 am' }
{'Tue 3rd Sep 2019 9:03:53 am' }
{'Thu 22nd Aug 2019 6:00:29 am' }
I would like to use datetime to recognize the dates in each cell, however the date contains the suffix for the day of the month ("14th", "10th", etc.), and I couldn't find an option in the input format to account for day suffixes.
If I (manually) remove the suffixes from the days, the following works fine:
datetime(T{1,1},'InputFormat','eeee dd MMMM yyyy hh:mm:ss a')
ans =
14-Oct-2019 08:23:48
Is there a way to account for the day suffixes (or to automatically remove them before using datetime)?
Pedro Viana

Accepted Answer

Peter Perkins
Peter Perkins on 4 Nov 2019
Pedro, you could put a literal th in the format,
'eeee dd ''th''MMMM yyyy hh:mm:ss a'
and read most of them, and go back and read all the places where you got a NaT, using a literal nd in the format, then again with a literal st. But honestly, the simplest thing is to use replace or strrep to pre-process the text.
Just out of curiosity, where did these timestamps come from?
  1 Comment
Pedro Viana
Pedro Viana on 5 Nov 2019
Thank you for your help. I ended up writing a looped script to remove the 2-letter suffix after the first number that appears on the string (independently of whether it's "th", "st", "nd", "rd").
for i = 1: size(T,1)
B = regexp(T{i,1},'\d*','Match'); % extract numbers in the string
U = char(T{i,1}); % change to char format
% concatenate the string from beginning up to number, then from space until
% the end
T{i,1}{:} = [U(1:4+size(B{1}{1},2)) U(5+size(B{1}{1},2)+2:end)];
These are entries from an eDiary app.
Thank you

Sign in to comment.

More Answers (1)

Jyotsna Talluri
Jyotsna Talluri on 5 Nov 2019
If dates are in a particular format given by you,suffixes {"th","nd","st","rd"} can be removed by
There can be other ways to do this also


Find more on Entering Commands in Help Center and File Exchange




Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!