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The grammar for parse-ietf-date has S ::= x09 | x0A | x0D | x20 but the prose (in a Note) says, the function... Accepts one or more whitespace characters (x20, x09, x0A, x0D) wherever a single space is required, and allows whitespace to be omitted where it is not required for parsing Probably it would be clearer to use S ::= ( x09 | x0A | x0D | x20 )+
The WG accepted this change to the grammar for parse-ietf-date
The change appears in the Dec 2014 CR publication.