How do I install Custom Day Length?

Install the matching mod loader (Forge, Fabric or NeoForge) for your Minecraft version. Download the .jar. Put it in the .minecraft/mods folder and launch that loader profile. Opens on CurseForge — not every file is mirrored on our own servers.

What Minecraft version does Custom Day Length work with?

The listing gives Minecraft 1.21.1, 1.20.1. This is the version stated by the author or source site, not something we verified ourselves.

Home›Java›Mods›Custom Day Length

ModsJava

Custom Day Length

Java mod listed for Minecraft 1.20–1.21. Downloads from the MC Java Mods app on Android.

by Foufakirby · on CurseForge

Dynamic Time – Custom Day & Night Lengths This mod allows you to fully control the length of day and night in Minecraft. Whether you want extra‑long days…

Which build do you need?

This mod ships a separate file for every mod loader and every version of the game. Pick both, then download — the wrong build installs fine and then does nothing in the game.

Mod loader

Mod loader Fabric2 builds
Mod loader Forge2 builds
Mod loader NeoForge1 build

Minecraft version

Minecraft 1.21.1Newest
Minecraft 1.20.1

Minecraft 1.21.1Newest
Minecraft 1.20.1

Minecraft 1.21.1Newest

⬇ Download for 1.21.1 · Fabric ⬇ Download for 1.20.1 · Fabric ⬇ Download for 1.21.1 · Forge ⬇ Download for 1.20.1 · Forge ⬇ Download for 1.21.1 · NeoForge

I don't know my version or loader

Open the Minecraft launcher and look at the profile you play on — it names both, like fabric-loader-1.21.4. The version also shows in the bottom-right corner of the game's main menu.

No loader in the profile name? Then it's plain Minecraft, and these mods won't run — you need Fabric or NeoForge installed first.

Open in MC Java Mods Get it on Google Play →

Dynamic Time – Custom Day & Night Lengths

This mod allows you to fully control the length of day and night in Minecraft. Whether you want extra‑long days for building or extended nights for a tougher survival experience, you can easily tweak the cycle to your liking.

This mod requires, Oblivious Core, mod that you can use as API if you wanna compute time length

Features

Adjust day length, night length, or the full day/night cycle in ticks
Minimum and maximum values are clamped to safe limits
Works on both singleplayer worlds and multiplayer servers
Changes apply instantly and persist for that world

Commands

All commands require OP level 2 or higher.

/timecycle setcycle <ticks> Sets the total day+night cycle length (ticks). Day and night will be split evenly.
/timecycle setday <ticks> Sets only the day length (ticks). Night length is adjusted automatically.
/timecycle setnight <ticks> Sets only the night length (ticks). Day length is adjusted automatically.
/timecycle get Shows the current configuration for day length, night length, and total cycle.

Tick Reference

1 second = 20 ticks
Vanilla day = 24000 ticks (12000 day / 12000 night)
Minimum cycle length: 2000 ticks
Maximum cycle length: 96000 ticks

Quick facts

Edition: Minecraft Java
File type: .jar
Minecraft versions listed: 1.21.1, 1.20.1
How to install: Install the matching mod loader (Forge, Fabric or NeoForge) for your Minecraft version. → Download the .jar. → Put it in the .minecraft/mods folder and launch that loader profile.
Where to get it: Opens on CurseForge — not every file is mirrored on our own servers.

Install steps are the general flow for this file type — How to install Minecraft Java mods & modpacks walks through it step by step.

File checked by MCModsHub

Ships as custom_day_length-neoforge-1.0.0-1.21.1.jar — drop this file into the mods folder
Download size: 7 KB
Download link checked 2 Oct 2026 — working

These come from our own check of the pack file, not from the source page.

Explore more

All Mods for Java All Minecraft Java mods Java mods for 1.21 Java mods for 1.20