https://docs.cloud.google.com/appengine/docs/standard/python3/reference/services/bundled/google/appengine/api/datastore_types/PackDatetime
google.appengine.api.datastore_types.PackDatetime | App Engine standard environment | Google Cloud...
Packs a datetime-typed property into a entity_pb2.PropertyValue.
app enginegoogleappengineapidatastore