7 Days to Die tool

7 Days to Die
blood moon calculator

Set day length, daylight and blood moon frequency, see how long you get between hordes in real time, then copy the SandboxCode for your server.

Use the tool7 Days to Die servers
  • Free
  • No sign-up
  • Runs in your browser

Horde night

When the horde comes,
in real time.

Three sandbox options decide when the blood moon horde arrives and how long it lasts. Move them and see what that means in real time.

Dusk moves with daylight
With 18 hours of daylight the horde runs from 22:00 to 04:00. Cut the daylight below 18 hours and dusk comes earlier, so the horde runs longer.
The range only adds days
Blood Moon Range adds anything from none to a set number of days on top of the frequency, so a horde can come later than planned. It never comes early.
How big it gets
Each horde sends a set number of zombies for every player online, held back by the server's zombie cap, which is 64 across the whole world by default.
Where these settings live now
Since V3.0 they're sandbox options, saved together as one SandboxCode in the server's config. The old BloodMoonFrequency and DayNightLength settings do nothing any more.
Between hordes
7h 00m
Horde night lasts
15m
First horde, new world
6h 38m

The horde runs from 22:00 to 04:00 in game, on day 7.

Paste the code your server uses now and only these three settings change in it. Left empty, it starts from AAAJABJACJADJARFBNC, the code serverconfig.xml comes with.

Your SandboxCode

AAAJABJACJADJARFBNC

Checked on a V3.3 dedicated server.

Read these as hours of play. Players report that the in-game clock stops while a server is empty, so a horde doesn't creep up on a server nobody's on.

Use it on your server

From here
to your server.

  1. Find your timing

    Move the three settings until the gap between hordes suits your group.

  2. Copy your code

    Paste in the code your server uses now and only these three settings change in it. Then copy the new code.

  3. Paste it into serverconfig.xml

    In your Game Panel, put it in SandboxCode in serverconfig.xml and restart the server. Type getsandboxoptions in the console to check.

Checked against

Last checked 24 October 2026

Help Centre

FAQ

Questions,
answered.

What people ask about this.

Will the code change my other sandbox settings?

Not if you paste your current code in first. The tool changes 24 Day Cycle, Daylight Length and Blood Moon Frequency and keeps the rest as it was. With nothing pasted, it starts from AAAJABJACJADJARFBNC, the code serverconfig.xml comes with, which is the old default Adventurer difficulty.

Which game version are the codes for?

V3.3. We checked them by loading codes from this tool on a V3.3 dedicated server and reading back what it applied. The Fun Pimps changed some sandbox options in V3.1, so after a big update, make your code again.

Why don't BloodMoonFrequency and DayNightLength do anything any more?

Since V3.0 they're sandbox options, set through the sandbox code instead, and the old settings do nothing.

Can the horde come earlier than the frequency says?

No. Blood Moon Range only adds days on top of the frequency, from none to a set number, so a horde can come later than planned but never early.

How many zombies come?

Each horde sends a set number of zombies for every player online, held back by the server's zombie cap, which is 64 across the whole world by default.

Why does the horde last longer with less daylight?

Dusk moves with daylight. With 18 hours of daylight the horde runs from 22:00 to 04:00; with less, dusk comes earlier, so the horde runs longer.

Does time pass when nobody's on?

Players report that the in-game clock stops while a server is empty, so read these times as hours of play.

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