On 13 January, Daniel was a bit miffed because people hadn't wished him a happy birthday.
For Daniel's birthday, he sang him a song.
Which got a bit weird.
This continues for a great many tweets.
And he was still singing the next day.
He also introduced some clowns. They would become a running theme.
Day three, and he's still singing.
Daniel's birthday is now taking place in what he describes as a "stricken, alternate London".
It's day four now, and the tone of Mr Croakley's tweets is becoming increasingly nightmarish.
It's now day five. Daniel had been told, via text message, that the tweets would stop. But...
...this was a lie.
If anything, London has become even more of a dystopia.
It's day six now, and Daniel is, in Mr Croakley's words, "a despot reigning over a world depleted and enfeebled by constant and joyless celebration".
He has also begun to drink the blood of animals.
People are now joining in.
Some haven't got the joke.
Right, let's take a moment and break for tea.
Day seven begins. There are a great many tweets on day seven.
Daniel is no doubt reassured by this tweet.
Day eight, and things are getting odder.
This goes on for some time. But let's skip to day nine. Now things are really grim.
More animal blood.
By day 11 there is fan art.
Rioting has begun in Daniel's kingdom.
By day 14, a short radio play.
By day 16, Twitter users are accepting Daniel as their lord and producing propaganda.
Day 17, and there is "full on mecha carnage".
By day 22, this was Mr Croakley's word cloud.
Day 23 was a bad day.
But we were soon back on track.
Day 37, and Daniel Barker is on Mars.
The whole thing is here. We are 38 days into Daniel Barker's birthday and it shows no sign of abating.
When – and how – can it possibly end? Mr Croakley tells BuzzFeed News: "The ongoing threat is that I won't stop until he holds a massive birthday party, in character, with us all dressed as clowns. Apparently some people are seriously looking at venue hire for this."
And Barker? He says: "I did wonder how long he would keep going. I said a few weeks ago, 'Surely you're going to have to kill me soon.' But who knows?"
Oh, and in case you were wondering, he tells us: "I had a nice birthday this year – didn't do much for a change. Was actually quite happy with people sending birthday wishes on Twitter."
And what's the whole experience been like? "Well, it's certainly odd to get such attention for something that isn't my doing at all. But it's been great fun. And now I just expect people to wish me happy birthday when I see them. Which is a weird thing to have in your brain."
On Mr Croakley, he says: "He's a good friend and a very talented writer, so mostly I just enjoy it along with everyone else. And feel only slightly resentful that nothing I tweet ever gets that kind of attention."