The ornamental design for a diningtable, as shown and described.
FIG. 1 is a perspective view of the present invention;
FIG. 2 is a right side view thereof;
FIG. 3 is a left side view thereof;
FIG. 4 is a front view thereof;
FIG. 5 is a rear view thereof;
FIG. 6 is a top plan view thereof; and,
FIG. 7 is a bottom plan view thereof.
The broken line showing in FIG. 7 is included for the purpose of illustrating unclaimed portions of the dining table and forms no part of the claimed design. The design of the present invention creates the illusion that the table top is floating above the base of the dining table.