willijar/cl-data-format-validation — pull request #1 by ska80 (2012-12-26 20:15:37+00:00)
Title: DECODE-UNIVERSAL-TIME signals an error if the supplied optional parameter TIMEZONE is NIL.

In some CL implementations (eg. Allegro CL, LispWorks) DECODE-UNIVERSAL-TIME
signals an error if the supplied optional parameter TIMEZONE is not in
the range (RATIONAL -24 24) or equals to NIL.