When there are missed notifications on your iPhone or iPad, a summary of what’s awaiting your attention is available in Notification Center. Each notification header displays an estimate of when it was received, but it’s not always as descriptive as you might want it to be.
A new free jailbreak tweak called ExactTime by gilshahar7 helps improve on this tiny frustration with iOS notifications by providing an exact time received in the notification header, rather than just an estimate.