It is /time set [time]
Replace [time]
with:
0 for Day
14000 for Night
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If you mean Minecraft Classic, this is not possible. Minecraft classic is only meant for building, not survival. If you want to have survival, you'd have to buy the full version. To change day to night in Minecraft premium (full), as of 1.3 the command prompt was added to single-player so issue the command /time set night.
It is not possible to change your name using a command, that function only works on mobs. There is a way to change your name but only for a small while in a server with plug-ins.
At this time, it currently isn't possible.
ex. /time set (time) ex. /time set day or /time set night
The only way to get a command block in Minecraft is to have cheats on in your world.Once you generated a world like that, type in the following command:/give [your Minecraft character's name] 137 [amount up to 64]That will give you a command block.