
Synchrono
Sync the in-game daylight cycle to a location in real life.
About this Mod
Synchrono
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.
Usage
Before starting to play, you need to set the coordinates of your server (or whichever place you want to sync in-game time to).
To get the appropriate coordinates, you could, for example, search for "<your city> coordinates" on the internet (geodatos.net often comes up). You should have two decimal values, either of which may be negative.
(In the future, this might be done automatically)
GUI configuration
In the GUI configuration menu (needs Mod Menu), you need the Latitude and Longitude options. If you're unsure which one is which, latitude usually comes first.
Configuration file
The configuration file (needed eg. when on a server) is located at <server directory>/config/synchrono.json5. It looks something like:
synchrono.json5
{
latitude: 51.11,
longitude: 17.02,
/* rest of the file */
}
Change the two values to your coordinates. Make sure you leave the commas on the end of the lines.
Other configuration options
See the wiki
Dependencies
Custom Time Cycle by eclipseisoffline is used to make the in-game daylight cycle slow down smoothly.
YetAnotherConfigLib is used for its configuration API and GUI.
Recommendations for other mods
Adjusted Phantom Spawns with both mods installed, automatically changes phantoms to only spawn after 3 real-life days have passed.
External API usage
This mod periodically queries some APIs on the internet to retrieve necessary data to function.
- SunriseSunset.io - needed for accurate localized sunrise and sunset timestamps.
- Open-Meteo.com - needed for realtime localized weather updates.
If your server doesn't have access to these, it might crash with the mod installed.
Available Versions
How to Install Synchrono on Your Server
Order Server
Order a Minecraft Java server with at least 3 GB RAM (4 GB recommended).
Set fabric Loader
In the panel under "Egg", select the fabric loader and matching Minecraft version (1.21.10).
Install Mod
Open the mod browser in the dashboard and search for "Synchrono". Click "Install" – done! Alternatively, upload the .jar via SFTP to the /mods folder.
Compatibility
Mod Loaders
Minecraft Versions
1.21.10, 1.21.9, 1.21.8 (+10 more)
Server-side
✓ RequiredRecommended RAM
4 GB(min. 3 GB)Frequently Asked Questions
Synchrono server crashes on startup – what to do?
Most common cause: wrong fabric version or insufficient RAM. Check the server log (latest.log) for "OutOfMemoryError" or "Mixin" errors. With Mado Hosting: ensure at least 3 GB RAM is allocated and the loader matches the mod version (1.21.10). You can switch loaders with one click in the panel.
Is Synchrono compatible with fabric?
Synchrono officially supports fabric for Minecraft 1.21.10, 1.21.9, 1.21.8. The Mado dashboard automatically detects incompatible loader combinations.
Server lagging with Synchrono – how to optimize performance?
Recommended RAM: 4 GB (per 8 players). Use /spark profiler to check if Synchrono consumes the most tick time. Common fixes: reduce server view-distance to 8-10, install "performant" or "starlight" as supplementary mods on Forge. With Mado Hosting, your server runs on NVMe SSDs with dedicated CPU cores for minimal latency.
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Rent Modded Server
Install Synchrono with just one click on your server.