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Okay, cool. Thanks for explaining further. As I'm sure you know, they explained in the TOS Writer's Guide that a Stardate like 1000.5 would generally fall around noon of that day.
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I'm aware, but have dismissed it. That would imply that a stardate (that is, the period elapsed from 1000.0 to 1001.0) is a 24 hour day. Let's examine that. If our earliest stardate is 1312 [WNMHGB] and our latest stardate is 5943 ["All Our Yesterdays] then that is a whopping 4,631 days! Or, in other words, a five year mission taking twelve years and eight months. Divide that by three and you get a period that fits comfortably in the five year window.
And to the OP, I'm sorry we took your thread about Uhura's memory wipe and hijacked it into a lengthy dissertation on the nature of stardates. We didn't mean to, but it was a fun ride!
--Alex