What is the ruling on a husband giving a gift to his wife on the occasion of her birthday with the intention of bringing joy, and is setting the date of the marriage contract (aqd al-qiran) on the same day as the fiancée's birthday considered an innovation (bid'ah) or something forbidden?

The ruling on celebrating birthdays has been previously explained, and this gift takes the ruling of the celebration. The husband can bring joy to his wife by giving her the gift before or after her birthday. There is no inherent legal prohibition in designating the birthday as the wedding anniversary day, unless it is done with the intention of celebrating that day. It is more cautious to choose another day.