Place dates, water, lemon juice, cinnamon and lemon zest into a medium saucepan. Bring to a boil. Boil for at least 10 minutes until the dates break down. Use a hand held blender (or regular blender) to puree the dates once cooked so they are smooth.
Place oats, flour, brown sugar, honey, butter and baking powder into a medium sized bowl and mix well.
Spray an 8x8 in pan and line with parchment paper.
Pour half the oat mixture into the bottom of the pan and gently push it down.
Pour the date mixture on top and use a spatula to spread it evenly over the bottom crisp.
Add remaining oat mixture on top of the date filling and gently press it down.