A little bit of time has passed, I still remember my father accompanied me to school that day, and that day is very important for me because it means I'm about to start my college life.
A little bit of time in the past, remember my father accompanied me to the school that day, and the day for me is very important, because it means I have started my university life.
A little later, remember the father I came to school that day, and this day is very important for me, because it means that I am about to begin my college life.