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* For format, all a type must do is implement to_stream. * For parse, each type X must specialize parse_manip<X,CharT,Traits>. Each specialization must include a public typedef to itself named type. * Each parse_manip specialization must have a stream extraction operator. * This commit depends on expression-SFINAE. If this commit breaks your build, it is likely that your compiler/version does not support expression-SFINAE. To fix this NO_EXPRESSION_SFINAE needs to be defined in the configuration area of date.h for that compiler/version.