press / (next to full stop) and type 'time set 0' then press enter. if you want to make it night type 'time set 140000' and press enter. Or you could install the too many items mod and do it with that.
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ex. /time set (time) ex. /time set day or /time set night
It is /time set [time] Replace [time] with: 0 for Day 14000 for Night
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
You can set TNT off in Minecraft Beta by clicking it, or by triggering it with redstone.