The command is /timeset day. This can only be used by admins and ops.
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/toggledownfall to stop or make rain in minecraft
ex. /time set (time) ex. /time set day or /time set night
You can't have commands on minecraft classic but you can in multiplayer classic
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.
Place a bed and right click on it to sleepIf cheats are enabled press 't' and type the command /time set day