Clocks work in a much similar way to how Compasses work in the sense that a player cannot use them to change the physical world; however, their display's change depending on the circumstances. The clock displays the Sun's and the Moon's position relative to the horizon.
The clock was added in the Halloween Update on October 31, 2010. Unlike other items, a player doesn't have to right-click while having a clock in hand in order to see the time. It shows a player when they are holding it in their hand. The clock was also added to the Minecraft: Pocket Edition in version 0.8.0.
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- Clocks and compasses are useless when they are used in the Nether or the End because time does not change, and there is no sun or moon.
- During this time, the clocks and compasses will sway around their dials like there's no tomorrow.
- Clocks and compasses can only work in the nether or the end if they are crafted in either dimension; however, they will only work in the dimension they are crafted in.
- In the 1.4.2 update, if a player puts a clock into an Item Frame, it will still work which means that this is a good way to make a "wall clock."
- The clock's texture is split into two parts - the clock body, and the dial. The dial part of the clock body texture is colored pink, and it is used for binary transparency in the in-game graphics. (In this case, the dial texture is an overlay for the pink section.)
- The clock is perhaps most useful while a player is underground since there is no real way to tell the time while a player is underground.
- Like compasses, clocks work in a Crafting Table which means that a player doesn't have to craft a clock in order to see the time.
- If sleeping with a clock in your hand, upon waking, or the time is changed through the commands, the clock dial will spin rapidly to catch up.