Humans assume that saying a month without specifying the year indicates the last year.
We infer the year from context. Consider:
What are we doing in December? (this year)
What are we doing in January? (next year)
What did we do in December? (last year)
Some short examples I have for humans assuming a much older year, giving a day and month:
Who attacked America on September 11th?
Who tried to burn the houses of parliament on 5th November?
I don’t think this fully explains your results, though.
We infer the year from context. Consider:
What are we doing in December? (this year)
What are we doing in January? (next year)
What did we do in December? (last year)
Some short examples I have for humans assuming a much older year, giving a day and month:
Who attacked America on September 11th?
Who tried to burn the houses of parliament on 5th November?
I don’t think this fully explains your results, though.