Phil Connors was in the denial stage at first. When he first wakes up from his slumber and realized that he was repeating everything that occurred that day. He didn't believe it and denied it right away. He denied because this is like utterly impossible to occur like you would think this would never happen too so it was normal for him to deny it.
Connors was then in the bargaining stage. Because he denied it but then he decided to like have fun with and go with the flow. Because he would always wake up and repeating the same thing everyday so he wouldn't face the consequences so he just did whatever and whatever he wanted to do and have fun with himself.
He was then in the depression stage. He went into the depression because of his life was being repeated and it got to him. Because it kept repeating he couldn't do anything new and he was bored. Living the same life everyday for the rest of your life got to him and he couldn't handle it so he went into this stage and was basically depressed and he kept on like committing suicide over and over.
Phil Connors was in the anger stage. He took it out on his alarm clock by smashing it into 100 pieces. Like waking up to the same thing everyday knowing that you'll be living the same thing again would make you angry too because you can't do anything about it and your forced to live it regardless of what you want.
Finally Connors enters the acceptance stage. He realized that if he was angry, depress and denied this he would never get anywhere. He decided that he would do good and master his skills in such arts like ice sculpturing, or playing the piano. Then he would try to save everyone from danger, for example when he knew the homeless old man would die, he tried to do everything he could until he finally saved him. Also enjoying his life with people and doing what it means to be the most valuable person.