Are you receiving the message Stop: The Campaign start date is later that close date, please update start date.?
Initiate Check Screen - Campaign Start Date
A campaign will not start sending until the start date is reached.
Once a close date has been reached no further emails will be sent from the campaign.
So these timings would mean that no emails would be sent if your campaign was to be initiated. Go back to the campaign details and edit the start or close date.