The `Scream 4` actor says he has been clean since checking out of the Betty Ford Center - where he underwent rehabilitation treatment for alcoholism - at the end of January and is starting to the joys of life again.
He tweeted: "I have 100 days of Sobriety today!!! Life is beautiful.:D (sic)"
David has previously revealed his estranged wife Courteney Cox and his actress sister Patricia Arquette were responsible for the intervention that resulted in him checking into rehab.
The 39-year-old actor - who raises a six-year-old daughter Coco with the former `Friends` star - said: "I came back from Miami and I had taken a nap and I woke up and Patricia and Courteney were at my bed. I was like, `What are you two doing here together?`
"Then I walked out and my best friend was there, my business partner and some guy I don`t know, and I go, `What up, turkeys? I guess this is my intervention.` "
He also admitted to drinking his first beer when he was just four years old.
He said: "I must have been four years old. I was down in the basement with my dad and the beer was there and I just grabbed it and drank it. I remember that. It`s one of my earliest memories."