Preheat oven to 180 degrees C.
Line a baking tray with baking paper.
Using electric beaters, cream the butter, sugar and vanilla in a medium bowl until light and fluffy (around 2-3mins)
Add egg, beating until just combined.
Sift in the flour and baking powder and add all the spices and stir until combined.
Stir through chopped dates.
Put sesame seeds into a small bowl.
Shape tablespoons of dough into balls and dip one side into the sesame seeds and place sesame side up on the tray. Continue until all the balls are lined up on the tray.
Using the back of a fork gently press down on each biscuit to flatten slightly.
Place in oven for 10 - 15 minutes, turning tray once, or until lightly golden brown.
Remove from oven and cool on tray for 5 minutes before transferring to a wire rack.