# File lib/sawyer/serializer.rb, line 75
    def encode_hash(hash)
      hash.keys.each do |key|
        case value = hash[key]
        when Date then hash[key] = value.to_time.utc.xmlschema
        when Time then hash[key] = value.utc.xmlschema
        when Hash then hash[key] = encode_hash(value)
        end
      end
      hash
    end