It was created on December 1st in 1969.
It was created on 1st December in 1969.
Or please give me another sentence with better construction, suitable for an interview.
Neither is correct Do not use 'in' 'on' or 1st Write - it was created December 1, 1969 Speak - 1 as first.
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Neither is correct
Do not use 'in' 'on' or 1st
Write - it was created December 1, 1969
Speak - 1 as first.
The first one is correct for speaking. You can say "in" or you can omit it.