JDCNV

       Converts Gregorian dates to Julian days

       For IDL versions V5.1 or greater, this procedure is superceded by
       JULDAY() function in the standard IDL distribution.   Note, however,
       that prior to V5.1 there wasa bug in JULDAY() that gave answers off
       by 0.5 days.

       JDCNV, YR, MN, DAY, HR, JULIAN

       YR = Year, integer scalar or vector
       MN = Month  integer (1-12) scalar or vector
       DAY = Day   integer 1-31) scalar or vector
       HR  = Hours and fractions of hours of universal time (U.T.), scalar
              or vector

       JULIAN = Julian date (double precision)

       To find the Julian Date at 1978 January 1, 0h (U.T.)
       IDL> JDCNV, 1978, 1, 1, 0., JULIAN
       will give JULIAN = 2443509.5

       (1) JDCNV will accept vector arguments
       (2) JULDATE is an alternate procedure to perform the same function

       Converted to IDL from Don Yeomans Comet Ephemeris Generator,
       B. Pfarr, STX, 6/15/88
       Converted to IDL V5.0   W. Landsman   September 1997

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