The daily fireworks are only triggered on a fresh launch of the game. So if the app is still cached on your device, they wont show up that day until the app reloads. It should do this on its own but you can force close the app to remove it from recent memory and the fireworks should trigger on the next launch if you hadn't seen them yet that day. Either way, your day counter should continue without interruption.
However, if you've moved the date on your device to a date in the future and viewed the fireworks, the app will record a timestamp and they will not go off again until 1 day after that time. If this is the case, you can either wait until that future date passes or, since the time stamp is tied to your game data, the only other way to reset it is to reinstall the app and start fresh.