Synchrono
by verarr
Synchrono links the in-game daylight cycle to the real-world position a server owner sets, so the sun rises and sets with the local time.
What it does
Before play starts, the server owner enters a latitude and a longitude in the configuration menu. Synchrono then changes the daylight cycle to follow that location, so the in-game sky tracks the real day across the year. The coordinates can be set for any place on Earth, and the choice applies to the whole server.
Synchrono works in the Fabric loader for game versions 1.20 – 1.21.10. It runs on the server alone, so players join without installing anything, and the configuration screen is reached through Mod Menu. The mod is released under the GNU Lesser General Public License v3.0 only and is open source. Its required dependencies are Custom Time Cycle, Fabric API and YetAnotherConfigLib (YACL), and Adjusted Phantom Spawns is optional.
Key features
Real-world daylight
The daylight cycle follows the sun at the configured latitude and longitude, so in-game days track real days.
Coordinate settings
Latitude and longitude are entered as two values in the configuration menu, with the latitude listed first.
Smooth slowdown
Custom Time Cycle is used to slow the in-game daylight cycle down smoothly rather than changing it abruptly.
Phantom spawning
With Adjusted Phantom Spawns installed, phantoms only spawn after three real-life days have passed.
Compatibility
Latest build for each game version and loader.
1.21.x11 of 11 versions with builds
1.20.x2 of 2 versions with builds
Only full game releases are shown. This mod publishes no snapshot builds.
Requirements
Dependencies declared by the latest file for each loader.
Required 3
Optional 1
Use cases
Real-time servers
A server owner who wants the sky to match the local clock can set the coordinates of their city once.
Seasonal builds
Because the cycle follows the calendar, the length of daylight changes through the year at the chosen location.
Who it’s for: Server owners who want the in-game day to follow a real location, and players on those servers who do not need to install anything.
How it compares
Offline Daylight Stop is server-side only and open source under the GNU Lesser General Public License v3.0 only, with files for 1.20 – 1.20.1, so it covers older versions than Synchrono. Realtime is also server-side only, under All rights reserved, and is published for 1.20.1 – 1.21.1. Stardom's Sync runs on both the client and the server, under All rights reserved, for 1.21 – 1.21.11.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Synchrono | Fabric | 1.20 – 1.21.10 | Server-side only | 2025-10-21 |
| Offline Daylight Stop | Fabric | 1.20 – 1.20.1 | Server-side only | 2023-07-31 |
| Realtime | Fabric | 1.20.1 – 1.21.1 | Server-side only | 2024-10-05 |
| Stardom's Sync | Fabric | 1.21 – 1.21.11 | Client and server | 2026-03-01 |
Questions
Does Synchrono need to be installed on the client?
Which game versions does Synchrono support?
How is the location set?
In the catalog
Synchrono is one of 29,952 Game mechanics mods on ModsFinder, and one of 19,630 Game mechanics mods for Fabric. 15,569 mods support Minecraft 1.21.10.
More from verarr
Similar mods
What the author says
A mod for Minecraft that syncs the in-game daylight cycle to a location in real life. It uses data from SunriseSunset.io to get accurate timestamps for sunrise and sunset, and Open-Meteo.com to get realtime weather updates. The location of the server can be set in configuration files.
Official listing
- Modrinth page
- modrinth.com/mod/synchrono
- Owner
- verarr
- Published
- 2024-10-16
- Updated on Modrinth
- 2025-10-21
- Facts verified
- 2026-10-15