Minecraft wiki entry for Daylight_cycle, associated text: /time set 0 – Sets the time to the beginning of the Minecraft day.
/time set day – Sets the time to 1000.
/time set 12000 – Sets the time to dusk/sunset.
/time set sunrise‌[Bedrock Edition only] - Sets the time to 23000.
/time set noon - Sets the time to 6000.