[CMS] Date in stories API

[palamago]

There is a difference in the ´date´ attribute between :
https://staging.oec.world/api/story (correct)
and
https://staging.oec.world/api/story/bottlenecks-in-the-fertilizer-industry-are-a-threat-to-the-food-supply (wrong)

[davelandry]

@jhmullen can we get a fix for this sometime before the end of this year? 🙏🏻 we are trying to port OEC blog to CMS stories, and would love our internal demo to be working before Christmas