英语日记用一般现在时,还是过去式

用一般过去时,因为是记述一天已经发生过的事情
如:July 1st,sunny
It was Sunday and it was sunny today.I went to the park with my parents.There were thousands of people in the park.Some of them played chess under the big tree.Some of them rowed boat on the lake.We climbed the mountain and had a picnic on the top of the mountain.Then we picked up the rubbish and threw it into the dustbin because it was our duty to protect the environment.Although we felt tired,we were really happy.

日记记的是当天已经发生的事，用一般过去时。

大部分是用一般过去时，但是如果你写的是你最近的近况，或者是习惯性动作就用一般现在时，其实一篇日记里可以用上各种时态的。
January 13 2005
It was the first day of our winter holiday. All of us were very happy. Why? Because we have one months to do things...

日记记得是一天已经发生的事，宜用一般过去式带完成时（假如对现在产生影响）事实可以用一般现在时
I was very sleepy in the morning, so i didn't go running as usual. I had something for breakfast. My new day has begin. The results would come out to...