The JUL_TO_DT function converts the Julian Day Number to an IDLDT date/time structure.The result is an array of IDLDT date/time variables. JUL_TO_DT uses CALDAT and VAR_TO_DT.
PRINT, JUL_TO_DT(JULDAY(6,23,1971)) ; Convert June 23, 1971 to the format defined by the IDLDT structure.