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Mid Day was created in 1979.
11.30 am to mid day (12.00) is 1/2 an hour
Mid day (12.00) to 7pm (19.00) is 7 hours
Therefore there are 7 and a half hours between the two.
The Mid-Autumn Day or Festival as it is known is used to celebrate the last day of the Fall harvest.
I think it was to be some time in early-mid February of 1967.
Act 3 scene 1