First mix the dates with the rice milk until the dates are very finely pureed.
Make sure that the sour cherries from the jar do not contain any pits.
Then add all the other ingredients and mix.
Notes
The recipe also works as ice cream. Just leave out the rice milk and use frozen fruit. If you can't find frozen blueberries and tart cherries, freeze them yourself. For ice cream, put the coconut milk in the fridge to set or freeze it.
For a less rich smoothie, use rice milk instead of coconut milk.