Pit all the dates: Using a small knife, slice the date lengthwise until you hit the pit (don't cut all the way through). Using your thumbs on both sides of the cut, gently open the date and remove the pit.
(Optional) Dampen part of a paper towel with orange blossom water and gently pat each date with it.
Divide the marzipan into 30 pieces of roughly equal size.
Slightly shape each piece marzipan to fit before stuffing inside the dates.
Top the marzipan with a piece of toasted pecan.