date.if_weekday looks like something one would find in Smalltalk class library, but (at least for GNU Smalltalk) only such construct I've found is this: http://

date.if_weekday looks like something one would find in Smalltalk class library, but (at least for GNU Smalltalk) only such construct I've found is this: http://www.gnu.org/software/smalltalk/manual-base/html_node/RegexResults_002dtesting.html#index-ifMatched_003a_0040_002d-3356 http://www.gnu.org/software/smalltalk/manual-base/html_node/...