A writing FORMAT is what the writing looks like.
"Diary tense" is not a recognized term in grammar or linguistics. It might refer to a writing style in which the author recounts events in a diary or journal format, typically using first-person narrative. If you are referring to different tenses used in diary writing, it would depend on the specific events being described, with past tense often being commonly used.
The literary term for diary style writing is "epistolary." This style involves using letters, diary entries, or other forms of communication as a primary narrative device in a work of fiction or non-fiction. It can provide insight into a character's inner thoughts and feelings.
writing format! blah!
She spent most of her time writing in her diary
yes
It is spelled Dear Diary.
A diary or a journal.
Writing
diary entry
no
Because she was a young girl writing a diary