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Date Time To Julian Day Function
Dates Times Class

Public Function DateTimeToJulianDay( _
    ByVal vDateTime As Variant _
    ) As Variant

Returns the Julian Day corresponding to a date/time value.

Examples: 
    DateTimeToJulianDay(#1/1/1899#) = 2414655.5
    DateTimeToJulianDay(#1/1/1899 9:00#) = 2414655.875
    DateTimeToJulianDay(#1/1/1965#) = 2438761.5
    DateTimeToJulianDay(#1/1/1965 9:00#) = 2438761.875
vDateTime: The date/time value whose Julian day number is returned. Function returns Null if vDateTime is Null or cannot be fixed up to a Date.

Note: This function DOES support pre-1900 Date/time values.

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