Tecumseh was killed while fighting on the British side at the Battle of Thames (near what is now Detroit) during the War of 1812. The War of 1812 STARTED in 1812 but continued longer than that and Tecumseh's actual death date was October 5, 1813.
Your death date is the day that you will die. It could be today or tomorrow or anyday anytime! Only God knows your death date if you believe in god! Also there are many different tests and quizzes you can take to figure out your 'death date' but they are more so just for fun.