Wiki Global EKG date of service

Grand Rapids, Michigan
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I'm hoping I can get some opinions and perhaps some reference to documentation indicating which scenario is appropriate.

Patient has an EKG performed on 2/1/16. The physician doesn't perform an official interpretation of this EKG until 2/5/16. Because it's all being done by the same provider, we would bill the global EKG code - 93000.

What date of service would you bill this under? 2/1 because that's when there was a face-to-face encounter for the testing? Or 2/5 because that's when the EKG was interpreted?

Thank you in advance!!