def items_since(date_time, opts = {})
      opts = opts.clone
      unless date_time.kind_of?(Date)
        raise EwsBadArgumentError, "First argument must be a Date or DateTime"
      end
      restr = {:restriction =>
        {:is_greater_than_or_equal_to =>
          [{:field_uRI => {:field_uRI=>'item:DateTimeReceived'}},
            {:field_uRI_or_constant =>{:constant => {:value=>date_time.to_datetime}}}]
        }}
        items(opts.merge(restr))
    end
def items_since(date_time, opts = {})
      opts = opts.clone
      unless date_time.kind_of?(Date)
        raise EwsBadArgumentError, "First argument must be a Date or DateTime"
      end
      restr = {:restriction =>
        {:is_greater_than_or_equal_to =>
          [{:field_uRI => {:field_uRI=>'item:DateTimeReceived'}},
            {:field_uRI_or_constant =>{:constant => {:value=>date_time.to_datetime}}}]
        }}
        items(opts.merge(restr))
    end
Fetch items since a give DateTime
 @param [DateTime] date_time the time to fetch Items since.