Western Cowboy Party Invitation Wording For A Western Themed Invitation, How Do I Phrase The Time.

For a western themed invitation, how do I phrase the time. - western cowboy party invitation wording

I need to know how the time of the day on a party-type invitation, but in the jargon of the cowboy. For example, if the party 5, which is a good way to say it, but it looks like a cowboy?