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    function tn = datenum(varargin)
%DATENUM convert tall array to serial date number.
%   Supported syntaxes for tall DATETIME:
%   DN = DATENUM(T)
%
%   Supported syntaxes for tall array:  
%   N = DATENUM(V)
%   N = DATENUM(S,F)
%   N = DATENUM(S,F,P)
%   N = DATENUM(S,P,F)
%   N = DATENUM(Y,MO,D)
%   N = DATENUM([Y,MO,D])
%   N = DATENUM(Y,MO,D,H,MI,S)
%   N = DATENUM([Y,MO,D,H,MI,S])
%   N = DATENUM(S)
%   N = DATENUM(S,P)
%
%   See also DATETIME/DATENUM, DATENUM.

%   Copyright 2015-2016 The MathWorks, Inc.

narginchk(1,6);
[varargin{1:nargin}] = tall.validateType(varargin{:}, mfilename, ...
                                         {'cellstr', 'char', 'numeric', 'datetime', 'duration'}, ...
                                         1:nargin);
tn = chunkfun(@datenum, varargin{:});
end