Full moons control several important vanilla survival mechanics, including peak slime spawn rates in swamp biomes, black cat spawns in villages, and tougher hostile mob equipment. Instead of checking the sky every night to guess the lunar phase, you can add a full moon countdown to your daily morning alert.
Turning On Moon Tracking
1. Make sure you have operator permissions active in your world.
2. Open chat and enter /function day_counter:config to bring up the in-game settings menu.
3. Reopen the chat box to use your mouse cursor, then click the moon tracking toggle in the interactive menu to enable the countdown.
4. Adjust your alert position between the title, subtitle, or action bar if you want to make room for the extra survival text.
Using the Morning Countdown
Once enabled, you do not need to run any commands to check the lunar schedule. Every time a new morning starts—whether your character sleeps through the night or stays awake until dawn breaks—the on-screen alert automatically shows the remaining days until the next full moon alongside the current world day. Watching this countdown each sunrise lets you gather weapons, clear out a swamp perimeter, or travel to a village days before the full moon arrives.