We know nothing about him personally, other than the approximate date of his work.

He quickly worked out the approximate date; it seemed to fit.

"I'd like you to identify it with an approximate date and culture."

I've been expecting the call; I remember the approximate date.

The approximate date by which the judging will be complete is June 8th.

The approximate date by which the judging will be complete is September 30th, 2011.

The approximate date or first mention of a technology in medieval Europe is given.

The approximate date for completing the evaluation is May 13, 2011.

For the moment, however, it is pertinent to consider the approximate date of each.

He may have been born slightly earlier than 1450, which is the approximate date most commonly given for his birth.