[plt-scheme] scalinger->date

In the past, I have found the date.ss module very easy
and convenient to use.  However, there is one issue
that I don't understand...

In the date.ss module there is a function:
date->julian/scalinger
However, there is no inverse function.  Is there a
reason for this?  I assume that one is well defined,
but perhaps the inverse problem is not well defined? 
It would be very convenient to have this function. I
have used the equivalent SRFI but it is not as
convenient to use.

Thank you for your help.

Dan Anderson

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