Preheat the oven to 180°C and line a medium loaf pan with baking paper.
Sift the flour, bicarbonate of soda and cinnamon into a large bowl, then stir in the dates and sugar.
Mash the bananas with a fork in a medium bowl. Add the milk and eggs, and combine.
Add the banana mixture to the dry mixture, stir gently until well combined.
Pour the batter into the pan. Bake for 40-45 minutes or until a skewer inserted into the centre of the cake comes out clean.
Rest for 5 minutes in the pan, then transfer the cake to a wire rack to cool completely, before serving.