The manga (which I've read) started in 2006..:

Future Diary (未来日記 Mirai Nikki?) is a Japanese manga series written and illustrated by Sakae Esuno. The manga was serialized in the Kadokawa Shoten's Shōnen Ace between January 2006 and December 2010.

The other guy who commented says this show ripped of a show that came out after it. this is actually a good watch but the sequals let it down.

I was looking forward to watching this but it's been a big let down. Perfect example of a concept that sounded good on paper but the execution failed big time. Not that it is that innovative.. it's basically a Future Diary rip-off.
At first I was impressed they didn't fail with Engrish and I enjoyed the Taxi Driver reference but from there on there on not much happend to build some kind of suspense. The story goes nowhere and it only runs for 11 episodes (and two movies later on). The writing is unsatisfactory and lazy including tons of things that make no sense AT ALL (!!). It doesn't help that I could have cared less about the "characters". I get the feeling that the target audience is the lower end of teenagers despite having enough things in there to not warrant that (has somebody counted how often the word "Johnnys" falls?). The art itself was nice but I hated the sporadic use of the "gag-style" which ruined the mood and some of the character designs are somehow weird aswell.
Not sure if I'm going to watch the movies.. looks like the first one is set in NYC? Does not seem like these are going to be much better :I?