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The calendar interface is accessed from the player's inventory with the tab that has an hourglass symbol.

  1. Season - Spring, Summer, Autumn, and Winter.
  2. Day - The day of the week, or name of a holiday.
  3. Date - The current in-game date.
  4. Hour - The current in-game hour.


Each season spans over three months, with "Early" being the first month and "Late" being the last month. Seasons are reversed south of the equator with the middle of winter in July and the middle of summer in January.

Season determines the current ambient temperature of an area, with temperatures being colder in the winter and warmer in the summer. During the colder seasons tree leaves can change color, and fruit trees will not grow new branches or leaf blocks. Berry Bushes and fruit trees only provide fruit during specific seasons depending on the type.

The player will start to freeze in the colder seasons if they do not have adequate Cold Protection Clothing to protect them from the cold.

Mouflon, the wild variant of Sheep, will only grow wool in the colder seasons.


In addition to the seven days of the week, the calendar will display the birthdays of the developers. Kitty's birthday will only appear if the config has been changed with a custom year length.

  • June 18 - Kitty's Birthday
  • July 7 - Bioxx's Birthday
  • November 2 - Dunk's Birthday


Newly generated worlds always start in the year 1000, on the first of June. By default, each month consists of 8 days for a total year length of 96 days.


The calendar uses military time to display the current in-game hour, with "The Witching Hour" being displayed for the final hour of the day. Although sleeping in a bed still wakes the player up at 6 o'clock in the morning, the visual sunrise and sunset is dependent on the latitude and the current date, daytime being longer in the summer and being shorter in the winter. In the equator, sunrise is at 6 a.m. and sunset is at 6 p.m. no matter what date it is. Mob spawning is also dependent on local sunrise and sunset.

Fog will appear first thing in the morning and dissipate around noon.


Main article: Configuration
Option Default
time Options related to time.
yearLength 96
This is how many days are in a year. Keep this to multiples of 12. [range: 96 ~ 12000]


v2 Release 21Added the calendar.
v2 Release 26Added buttons to the calendar when debug mode is enabled.
0.78.0Removed the keybinding to open the calendar interface and replaced it with a tab in the player's inventory.
0.81.6Sunrise and sunset was adjusted to change length according to the current date and latitude.
0.82.0Monsters now accurately spawn based on the local day/night cycle.