The Timewood Clock is the functional block of the Tree of Time, one of the four magic trees introduced by the Twilight Forest mod. This block can be activated or deactivated with a right click. When active (i.e. when the clock embedded in the tree is colored in and not grey), it will increase the speed/frequency of certain nearby processes. These processes include but are not limited to the growth of plants such as crops and saplings, the smelting rate of furnaces, and the spawning of mobs. (verifications needed) In addition, when active, it will produce a steady ticking sound, which can be useful in detecting and measuring lag; when the game is frozen or unresponsive, or when the game is experiencing a lag spike, the ticking will stop. Whether active or inactive, it gives off light with a level of fourteen, the brightness of a torch.
It can be broken and obtained only by using a silk touch tool. If you use an axe, you must sneak while mining the block or else Treecapitator will be invoked and the clock will become a regular Timewood block regardless of the axe's enchantment.