Rick Rothstein wrote...
....
Question... do you really need the +0.5 at the very end of your
formula? Putting it in adjust the returned date to 12 noon; I think
the OP simply needed the date of the applicable 1st Tuesday and not
the date plus a time offset.

It doesn't hurt. If the formula were numerically formatted just to
show the date, it'll display the correct date. If it were formatted to
show date and time, it'll show the correct time. The 4 or so CPU
cycles needed to add a constant power of 2 to the INT() call's result
shouldn't cause undue performance drag.