%% Convert Date with Milliseconds to Date Vector

datevec('11:21:02.647','HH:MM:SS.FFF')

% In the output date vector, milliseconds are a fractional part of the seconds field. The text '11:21:02.647' does not contain enough information to convert to a full date vector. The days default to 1, months default to January, and years default to the current year.
% Copyright 2012 The MathWorks, Inc.