A product launch works when availability, fame and conversion arrive at the same moment. Running every channel on the same date is not automatically integrated if each one is doing the same vague job. 

TV can introduce the story at scale. OOH makes the launch visible in the physical world. Paid social can test messages before launch, amplify the main burst and turn interest into action afterwards. One Day brings TV, OOH and paid social into one launch plan. 

The sequence below is a framework rather than a fixed calendar. Product category, distribution, budget, purchase cycle and audience behaviour should determine the exact dates.