Sean “Diddy” Combs is detailing how prison has changed him.

One day before learning how much time he will serve for his convictions on two counts of transporting individuals for prostitution, the Bad Boy Records founder—who has remained behind bars since last September—revealed he is now sober in a letter submitted to the judge presiding over his case.

“Although this situation has been the hardest and darkest time in my life, good things have come out of my incarceration,” Combs wrote in his Oct. 2 letter, obtained by NBC News . “For starters, I am now sober for the first time in 25 years. I have been trying my best to deal with my drug abuse and anger issues and take accountability as well as positive steps towards healing.”

While noting that he lost his “way” in “the dr

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