I need your help guys
The most beautiful day , the day when I graduated four years ago????

Are there any mistakes?
Thanks a lot

Question

I need your help guys
The most beautiful day , the day when I graduated four years ago????

Are there any mistakes? 
Thanks a lot

Answer

It's a part of a sentence.  It's not a complete sentence because it lacks a main verb. As you started the sentence with a capital "T", I think that you think it's a complete sentence.  Can you add a main verb?

Answer

I finished the college. . So i used ago

Answer

The most beautiful day is the day when  I have graduated after 4 years.
you have studied for 4 years ago.
you have studied since 2011.
you wait graduating from your college or school.

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