Date2DN:

Path: Common/Time

% Compute the day number from the date. Uses the format from clock. 
 If no inputs are given it will compute the day number for the instant
 of the function call.

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   Form:
   dn = Date2DN( datetime )
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   ------
   Inputs
   ------
   datetime     (1,6) [year month day hour minute seconds]

   -------
   Outputs
   -------
   dn           (1,1) Day number

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   References: Montenbruck, O., T.Pfleger, Astronomy on the Personal
               Computer, Springer-Verlag, Berlin, 1991, p. 12.
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Children:

Common: Time/DTSToDTA
Common: Time/Date2JD

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