Clock

"Keep track of the scary time! A craftable watch lets you know when it's safe to emerge from the caves."

- The Halloween Update promo poster

Clocks are items that display the current in-game time by displaying the sun and the moon's position relative to the horizon.

Trading
Expert-level librarian villagers have $1/3$ chance to sell a single clock for 4 emeralds as part of their trades.

Expert-level librarian villagers have a 50% chance to sell a clock for 5 emeralds.

Usage
The clock dial consists of two halves, a day side and a night side. The dial spins clockwise slowly to indicate the time of day, corresponding to the sun or moon's actual position in the sky. The player is able to sleep a few seconds after the clock shows exactly dusk.

The dial can be read from a clock in any of its representations: held in a player's hand, placed in any inventory or crafting grid, in an item frame, and even as a dropped item.

Because there is no day/night cycle in the Nether or the End, clocks do not work properly in these dimensions. Instead, the dial rotates rapidly and randomly, making them useless.

Video
Note: This video doesn't state that Clocks can be found in buried treasure.

Trivia

 * $1/3$, a clock can be viewed under the item statistics page as long as one obtained a clock at some point. It can also be viewed in recipe book if the recipe for it has been unlocked.
 * $$, the default resource pack for the clock contains 64 individual frames.
 * When the time of day changes suddenly, such as after sleeping or when is used, the clock dial will spin rapidly to catch up.
 * After completing 100 day-and-night cycles $$, the player is awarded an achievement, and $$, they are also awarded a miniature clock wristwatch for the Xbox Live avatar to wear.
 * Although clocks do not function in the Nether or the End, the actual day-night cycle does continue.
 * Despite that redstone is used in its crafting recipe, this item is neither a redstone component nor a redstone power source.

Hodiny Uhr Reloj Montre Orologio Óra 時計 시계 Klok Zegar Relógio Часы 时钟