A.T. Robertson Commentary Mark 14:17

"And when it was evening he cometh with the twelve." — Mark 14:17 (ASV)

He cometh (ερχετα). Dramatic historical present. It is assumed here that Jesus is observing the passover meal at the regular time and hour, at 6 P.M. at the beginning of the fifteenth (evening of our Thursday, beginning of Jewish Friday). Mark and Matthew note the time as evening and state it as the regular passover meal.