NIP-22
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Unacceptable Event `created_at` time
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`draft` `optional` `author:jeffthibault`

Relays may support notifying clients that the event they published has an unacceptable `created_at` time. A relay will will consider the `created_at` time unacceptable if the `created_at` time is more than **[limit]** before the event was received by the relay. 

If a relay supports this NIP, the relay SHOULD send the client a `NOTICE` message saying the event was not stored because the timestamp was too old.

Client Behavior
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Clients SHOULD use the `supported_nips` field to learn if a relay supports event `created_at` checks.

Motivation
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The motivation for this NIP is to prevent clients from saying they published an event *significantly* earlier than they actually did.

The event `created_at` field is just a unix timestamp (integer) so one could set it to a time in the past. For example, the `created_at` field could be set to a time 10 years ago even though it was created today and it could still be a valid event. This NIP aims to set a maximum amount of time elapsed between when an event was created and when it was *actually* published.