insert datetime in array

% a datetime array:
fmt = 'uuuu-MM-dd';
dt_array = datetime({'2008-01-05','2008-02-02','2008-03-01','2008-04-05'},'InputFormat',fmt)
dt_array = 1×4 datetime array
   05-Jan-2008   02-Feb-2008   01-Mar-2008   05-Apr-2008
% a datetime scalar:
new_dt = datetime('2008-03-28','InputFormat',fmt)
new_dt = datetime
   28-Mar-2008
% concatenate and sort:
dt_array = sort([dt_array new_dt])
dt_array = 1×5 datetime array
   05-Jan-2008   02-Feb-2008   01-Mar-2008   28-Mar-2008   05-Apr-2008

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Voss 2024-2-27

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Another more involved way is to find where the new element belongs in the array and insert it there:

% a datetime array:
fmt = 'uuuu-MM-dd';
dt_array = datetime({'2008-01-05','2008-02-02','2008-03-01','2008-04-05'},'InputFormat',fmt)
dt_array = 1×4 datetime array
   05-Jan-2008   02-Feb-2008   01-Mar-2008   05-Apr-2008
% a datetime scalar:
new_dt = datetime('2008-03-28','InputFormat',fmt)
new_dt = datetime
   28-Mar-2008
% make sure the array is sorted
if ~issorted(dt_array)
    % and sort it if not
    dt_array = sort(dt_array);
end
% find the index of the first element of dt_array later than new_dt
idx = find(dt_array > new_dt, 1);
% if there are no elements later than new_dt
if isempty(idx)
    % then new_dt goes on the end
    idx = numel(dt_array)+1;
end
% insert dt_new at index idx in dt_array
dt_array = [dt_array(1:idx-1) new_dt dt_array(idx:end)]
dt_array = 1×5 datetime array
   05-Jan-2008   02-Feb-2008   01-Mar-2008   28-Mar-2008   05-Apr-2008