The Gospel of John offers a different chronology of the Last Supper than Mark and the other synoptic gospels. For Mark, the setting for the supper is Passover (see Mark 14). For John, the supper is clearly not a Passover meal. And for John, there are no words of institution. The central focus is not the sacraments (there are none), but the act of foot washing. For John, the act of remembering Jesus is not accomplished by breaking bread and drinking wine as ritual, but by serving others (see John 13).
For a comparison of the two chronologies, see the chart below.