date at, date back, date from, date to

Any of these prepositions may be used with date:

            The fossil has been dated at 5.8 million years ago.

            Another was dated at between 5.8 and 5.6 million years ago.

            The scientists dated the dinosaur bone to 65 million years ago.

            Dated to more than 10,000 years ago, the oldest rock art suggests. . . .

            The west wing of the castle dates from 1400.

            He was able to date the remains back to 1500 B.C.