The .Time Stop datapack adds a craftable tool, the Time Stopper,
to craft a Time Stopper you have to smith a Clock with a Netherite Ingot in a smithing table.

1.20.1 CRAFTING UPDATE
The recipe is different on 1.20 and 1.20.1, to craft the Time Stopper you will still need a smithing table, but the recipe has been changed:
you will need a Netherite Upgrade, a Clock, and a Nether Star, this change does not apply on 1.19.


Once you hold the Time Stopper in your hand(not the offhand), by pressing the Right-Mouse button you will stop/resume time,
while the time is stopped entities and projectiles cannot move, only the players with a Time Stopper in their Hotbar(or offhand) will be able to move.



If you keep pressed shift while holding the Time Stopper, it will transform in the Time Stop Options book,
if you stop shifting it will turn again in the Time Stopper



The Time Stop Options book is necessary to change the options of the stopped time,
like if mobs moves or not while hurt,
or the sound effect you want to hear when you stop/resume time.



Using the Time Stopper with a lot of entities could cause lag if you don't have a powerful enough pc.