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Is time reverse possible in Minecraft? Question
Say I wanted to make a "time machine" using command blocks. I can use /time add to change the time and make things faster, but I don't know how to subtract time as a /time subtract command doesn't exist.
How do I subtract time in Minecraft?
2 answers
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Yes, it's possible to reverse time in Minecraft. You can do so by using a negative integer in a /time add command.
/time add -1000
While a /time subtract doesn't exist, you may still use any integer in /time add as there's no restriction to using non-negative integers for the command.
You cannot properly do this in vanilla Minecraft, but there may be mods for it. However, you can cheat a little bit. One day is 24 000 ticks, so you can use /time add 23999 to make it seem like the sun and moon are going backwards. In reality, though, time will pass forward, so everything that reads the day time, will know you're going fast forward instead.
This only affects the time of the day, though, so it won't affect entities like mobs, in any way. If you want them to go backwards, spawn in on fire during early morning, gradually gain health, and eventually cut the fire when the sun goes down and moon comes up, Minecraft doesn't supply you with the tools to do that so simply. You may still not be out of luck with that, though. You may be able to either use command blocks or datapacks to spawn in the mobs when they should've died with time going forward, and initially set them on fire, then gradually increase their HP each tick.
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