DAYCNV

       Converts Julian dates to Gregorian calendar dates

       DAYCNV, XJD, YR, MN, DAY, HR

       XJD = Julian date, positive double precision scalar or vector

       YR = Year (Integer)
       MN = Month (Integer)
       DAY = Day (Integer)
       HR = Hours and fractional hours (Real).   If XJD is a vector,
               then YR,MN,DAY and HR will be vectors of the same length.

       IDL> DAYCNV, 2440000.D, yr, mn, day, hr
       yields yr = 1968, mn =5, day = 23, hr =12.

       Be sure that the Julian date is specified as double precision to
       maintain accuracy at the fractional hour level.

       Uses the algorithm of Fliegel and Van Flandern (1968) as reported in
       the "Explanatory Supplement to the Astronomical Almanac" (1992), p. 604
       Works for all Gregorian calendar dates with XJD > 0, i.e., dates after
       -4713 November 23.

       Converted to IDL from Yeoman's Comet Ephemeris Generator,
       B. Pfarr, STX, 6/16/88
       Converted to IDL V5.0   W. Landsman   September 1997

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