How to dry dates effectively for long-term storage?

To dry dates effectively for long-term storage, first wash and pit the dates. Then, spread them out in a single layer on a baking sheet and place them in an oven set to the lowest temperature possible. Leave the oven door slightly ajar to allow moisture to escape. Check the dates regularly and turn them over to ensure even drying. Once they are dry and leathery, store them in an airtight container in a cool, dark place.