Without help from any media (your brain and a calendar only) think back to April 11, 2016. What did you do that day? What did you wear? Who did you talk to? Did anything specific happen?
Write down what you can remember....
Now access social media, texts, etc to see if there is any evidence to support or negate your original thoughts. What changed or what supported your original thought? Can you now accurately answer the above questions? If so, do that.