Past tense - Diaries are usually written about an event that has already occurred so should be written in the past tense.
This video explains about different tenses -
https://www.youtube.com/watch?v=7GAjEdOiNaI
I would recommend watching the video more than once! Click here for the worksheet for today
Challenge: Click here for an explanation of different tenses - can you write a sentence in each tense?