You’ve been soaring through Gotham’s rainy skyline for hours. You're cleaning up the last of Nigma’s annoying trophies. Then you see it—the riddle that mentions a "calendar killer" who took his leave. It’s one of those moments that makes your brain itch. If you’ve played Batman: Arkham Knight, you know exactly which one I mean. The riddle is simple: "He saved the date! All Hallow’s Eve! But this calendar killer took his leave."
Most players scan the environment, get confused, and eventually look it up. But there is a whole layer of lore and a very specific "true" ending connection that people usually overlook. Honestly, Julian Day (the Calendar Man) is probably the creepiest character in the entire Rocksteady trilogy, mostly because he’s playing a much longer game than Scarecrow or the Arkham Knight ever were.
Finding the Calendar Man Room: He Saved the Date Explained
If you are just looking for the location to check a box on your map, you need to head to Founders’ Island. Specifically, look near the subway entrance that leads toward the Arkham Knight’s HQ (near Ryker Heights).
A lot of people struggle here because the map marker is deceptive. It looks like it’s on the street or deep in the tunnels. It’s actually in between. You have to find a specific hole in the ceiling of the underground section—sort of a maintenance area—and grapple up. Inside, you’ll find a room that looks like a serial killer’s craft project.
✨ Don't miss: Mario Kart 8 Tracks: Why Some Courses Just Feel Better Than Others
There are calendars everywhere. Sticky notes. A very disturbing atmosphere. To solve the riddle Arkham Knight he saved the date, you just need to scan the desk where the calendar is sitting.
Why the date is Halloween
The game takes place on Halloween. This is Julian Day’s favorite holiday. But if you look at the notes in that secret room, you’ll realize he didn't just "leave" because he was bored. He was actually planning a massive attack for that very night.
He got upstaged.
💡 You might also like: Baldur's Gate 3 Raphael: Why This Devil Is The One Choice You'll Probably Regret
Scarecrow’s fear gas plot was so big and so loud that Julian Day basically decided it wasn't worth the effort to compete. He "saved the date" for himself, saw someone else had already ruined the party, and decided to watch from the sidelines instead.
The Secret Knightfall Connection
This is the part that most casual players miss. If you think that riddle is the last time you see Calendar Man, you haven't been paying attention to the crowds.
Remember the "true" ending? The one you get for 100% completion where Bruce Wayne walks into Wayne Manor right before it explodes?
👉 See also: Kingdra ex Pokemon Card: What Most Players Get Wrong
If you look at the crowd of reporters and onlookers standing outside the gates of the manor during that final cutscene, Julian Day is standing right there. He’s hard to spot. You’ll see the back of a bald head with those distinctive circular tattoos representing the months of the year. He promised Batman back in Arkham City that he would be there at the end. He kept his word. He saved the date for Bruce’s "death."
The "Storyteller" Legacy
This whole "he saved the date" thing is actually a massive callback to the previous game, Arkham City.
- In Arkham City, there was a trophy called Storyteller.
- You had to visit Calendar Man in the courthouse basement on 12 specific holidays.
- These had to be the actual real-world dates (or you had to cheat by changing your console’s system clock).
- If you did all twelve, he would give a creepy speech and then escape his cell, leaving a dead body in his place.
In Arkham Knight, the riddle is Rocksteady’s way of closing the loop on that specific side-quest. It proves that his escape in the previous game was canon and that he’s still out there, lurking in the shadows of Gotham.
Practical Tips for the 100% Run
If you’re currently trying to wrap up the Riddler challenges to see that secret ending, don’t let the Founders’ Island map icons frustrate you. The verticality in Arkham Knight is much more intense than in the previous games.
- Look Up: Almost every "missing" riddle on Founders’ Island is hidden in a ceiling nook or a wall you have to winch down with the Batmobile.
- Interrogate the Green Guys: Don't kill the Riddler informants too early. If you see a green glow in a group of thugs, take everyone else out first.
- The Sonar Trick: Many of the puzzles in the "He saved the date" area require the Batmobile’s sonar. If you’re stuck, pulse the sonar and follow the question marks on the ground.
Basically, Julian Day represents the "old school" Gotham villainy. While the Arkham Knight is all about tanks and militia tech, Calendar Man is about the long-form psychological trauma. He didn't need a militia to beat Batman; he just needed to wait for the right day on the calendar.
Actionable Next Steps:
Go to the underground section of Founders’ Island near the HQ entrance. Look for the grapple point in the ceiling to find the hidden room. Scan the calendar on the desk to complete the "He saved the date" riddle. Once you’ve done that, focus on finishing the rest of the 243 Riddler challenges so you can trigger the full Knightfall Protocol and see Julian Day’s cameo in the final cutscene yourself.