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  1. f = @(s) datestr(addtodate(datenum(s), 1, 'second'), 'HH:MM:SS');
  2. in = ['00:00:00';'23:59:59'], out = f(in)
Success #stdin #stdout 0.14s 48560KB
stdin
Standard input is empty
stdout
in =

00:00:00
23:59:59

out =

00:00:01
00:00:00