[ATimson]

The Wormhole wrote:

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For those wondering, April did indeed command another Enterprise which was decommissioned two years earlier. April himself commanded the ship twenty years earlier and was believed to have been killed in action.

So assuming the "20 years" figure to be accurate, and not either rounded or just plain wrong (like the age of the Enterprise in TSFS):

• April's Enterprise-α was commissioned sometime between 2233 (earlier would be a violation of Prime canon) and 2240.
• April became captain sometime between commissioning and when he was lost - earlier is "better", to give him more time to build up enough of a legend where Kirk recognizes the name.
• April was lost between 2238 and 2240.
• Countdown to Darkness takes place sometime between 2258 and 2260.

I hope we find out more about April's Enterprise, how it came to be, and how it's different from his Enterprise as depicted (apocryphally) in Diane Carey's books...