Diary

Greg's diary is his biggest job in the series. Without it, there would be no way to to know what happens in his life. So far there have been 7 of them. The first one is red, second is darkish blue, 3rd is green, 4th is yellow, 5th is purple, and 6th is icy blue, 7 is brown, and 8 is not confirmed. All of them say DIARY on the cover,Greg exclaims how he told Susan to get one that doesn't says Diary,but his mother still got one that said Diary probably because it was cheaper.All of them have little drawings between the texts based on what Greg's talking about.Each Diary has 217 pages and some of them also have 17 activity pages and  the activities are extracted from the Do-It Yourself Book.

Trivia

 * ​Each diary has its own months. So far in all Diaries, there are a total of 30 months which is the same as  2 years and six-months.
 * Ist owns September, October, November, December, January, February, March, April, May, and June
 * 2nd owns September, October, November, and December
 * 3rd owns January, February, March, April, May, and June
 * 4th owns June, July, and August
 * 5th owns September, October, and November
 * The 6th and 7th book have the least month then the others. 6th owns November and December and 7th  owns January and Febuary
 * In Rodrick Rules, it was later revealed that Rodrick snatched Greg's diary and ran but tripped over,then Greg quickly got the Diary and without noticing went to the Leisure Tower's Women's bathroom and destroyed it and flushed in the toilet and then wen the security came and got him out,Rodrick saw the whole thing and blew his secret 4-6 months later.
 * Greg rips out certain pages of his diary, which can be seen in movies and games sometimes. In the first andRipped_page.png) second Diary of a Wimpy Kid movies, you see pages which were never in the book, meaning Greg probably ripped them out.