WHAT IS TIME?

What is time? Today is Wednesday but it was Monday two years a go when he passed away. The weather  was cold as it is now. But it was not Wednesday. So today is not the same day. then when he died? On 8th of April or on a cold Monday. When should I remember my pain? On Monday, On Wednesday which is gonna be Thursday next year.

What is time? I don't know but I remember him everyday. I changed so I can not ignore the change.
It is said that time is not linear  and everything happens only in now. We just think that there is tomorrow and yesterday. They say it is not real. 
I am confused. What is time?
Love to all