How to add seconds to a HH:mm DateTime array ?

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How do I add seconds as: ss = 00 to a datetime array of the form MM/dd/YYYY HH:mm: 04/15/2016 01:00 as an example
  1 Comment
Douglas Leaffer
Douglas Leaffer on 6 Jun 2023
Thank you. Seems I was able to simply click on the timetable in the workspace and then in the Editor window, select (highlight) the column of datetime, then in thwe View tab in the menu select Date/Time Format MM/dd/yyyy HH:mm:ss and MATLAB added :00 seconds to each time row, which is what I needed. Regards

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Answers (3)

Nikhil on 6 Jun 2023
Hello Douglas,
Try this:
% Original datetime array
datetimeArray = datetime('04/15/2016 01:00', 'InputFormat', 'MM/dd/yyyy HH:mm');
% Create an array of seconds (all zeros in this case)
secondsArray = seconds(zeros(size(datetimeArray)));
% Add the seconds to the datetime array
datetimeArrayWithSeconds = datetimeArray + secondsArray;

Les Beckham
Les Beckham on 6 Jun 2023
datetime objects always have a seconds field. If you don't set it, it will already be zero by default, so you don't need to "add" anything. Also, Matlab displays the seconds by default. See example below.
datetimeArray = datetime('04/15/2016 01:00', 'InputFormat', 'MM/dd/yyyy HH:mm')
datetimeArray = datetime
15-Apr-2016 01:00:00
ans = 'dd-MMM-uuuu HH:mm:ss'

Steven Lord
Steven Lord on 6 Jun 2023
Do you want to actually add seconds to the value (changing the time) or do you want to add seconds to the display (leaving the time alone)? Let's create some sample data.
dt = datetime('now') % Default display format includes seconds
dt = datetime
06-Jun-2023 18:57:30
dt.Format = 'MM/dd/yyyy HH:mm' % Change the format so seconds aren't included
dt = datetime
06/06/2023 18:57
We can add seconds to the time, making the new value not the same as the previous value
dt2 = dt + seconds(30) % change the value
dt2 = datetime
06/06/2023 18:58
dt2 == dt % false
ans = logical
Or we can add seconds to the display, leaving the new value the same as the previous value.
dt3 = dt
dt3 = datetime
06/06/2023 18:57
dt3.Format = dt3.Format + ":ss" % Change the display format to include seconds again
dt3 = datetime
06/06/2023 18:57:30
dt3 == dt % true
ans = logical




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