What is the white powder on medjool dates?

The white powder on Medjool dates is typically a natural sugar bloom, which occurs when the sugars within the fruit crystallize on the surface. This phenomenon is common in dried fruits and is harmless. It can also indicate that the dates are high in natural sugars and have been stored properly. If the powder is excessive or accompanied by off smells, it may suggest spoilage, and it's best to discard them.