Date2JD:

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   Compute the Julian Date from the date. Uses the format from clock. If
   no inputs are given, it will compute the Julian date for the instant
   of the function call. Only works for dates after 1600. You may omit
   the last three numbers (hour minute seconds) in the array.
   The date is in Greenwich Mean Time

   Since version 1.
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   Form:
   jd = Date2JD( datetime )
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   ------
   Inputs
   ------
   datetime      (1,6) [year month day hour minute seconds]
                       or the datetime data structure.
                               .year
                               .month                             
                               .day                             
                               .hour                             
                               .minute                             
                               .second
                       

   -------
   Outputs
   -------
   jd            (1,1) Julian date

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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