I don't know how to set the date properly on my Tag Heuer formula 1 watch. Is there a time of the day that I should do it?

try the link below
http://www.youtube.com/watch?v=GvAEU7xRGsk&feature=related

TO SET TIME AND DATE, PUSH SIDE BUTTONS TOGETHER OR AT SAME TIME TO MAKE THE SCREEN OR FACE OF WATCH APPEAR WITH ITS TIME OR DATE, THEN GO TO OTHER SIDE BUTTONS TO GO UP OR DOWN ON THE TIME OR DATE UNTIL YOU GET TO THE PROPER TIME AND DATE. THEN GO BACK TO FIRST BUTTONS YOU PUSHED AND PUSH THEM ONCE MORE TO GET OUT OF THE SETTING MODE.

You change the date the same way you change the time. The only difference being pull the crown out 1/2 way to the first click instead of all the way out.

mcdevito75 here, That sounds about right, each watch is slightly different, some watches, have the date change at 10:30 PM and some at 11:00 PM, and if your Tag also has the month or day to change along with the date, this could account for the date changeing kind of late. I don"t think it"s anything to worry about.

mcdevito75 here, Best Bet, call the warantee people for their suggeston.

Some watches need to have the crown unscrewed.
Try turning it anticlockwise then pull out.

If this doesn't solve your problem, go to the TAG site "tagheuer.com" and find your nearest dealer.

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To s e t t h e t i m e a n d d a t e
Your TAG Heuer chronograph is fitted
with a screw-in crown and safety seals
which guarantee it to be waterproof
to 200 m (660 ft).
Position 0: Crown is screwed in
(normal position).
Important: The crown must be
screwed in correctly to guarantee
the water-resistance of the watch.
Position 1: Crown unscrewed.
To change the hour (change of time
zone) or date quickly, unscrew the
crown, pull it out to position 2 (quick
corrector) and turn it in either
direction. This mode allows you to
change the hour and the date without
any loss of minutes.
The date changes each time the
hour-hand passes midnight.
To set the time, unscrew the crown,
pull it out to position 3 (setting the
time) and turn it in either direction.
After setting the date or the
time, push the crown back and
screw in to position 0.

Tags have a screw down crown (winder knob) turn the knob counter clock-wise until you feel the crown unscrew (not off) then pull the crown carfully. It will pop once this is for date adjust. Then pull once more and you can now adjust the hands, set accordingly then push crown back in. After you push it back in gently compress the crown and tighten clockwise until it stops. CAUTION!!!!!!! Tags are not waterproof if the crown is not screwed back down. I hope this helps I am actually a car guy (just happen to own a couple)