'Noon' means 'midday' or 12 o'clock during the day.

Noon is the time exactly halfway through the day (12.00-12:00 in the 24-hour clock and 12:00 PM-12:00 PM in the 12-hour clock). Midday also means noon, although this also means around noon, or very early afternoon.

To most, the word noon signifies a specific time of day–namely, 12:00 midday (aka “lunchtime”). But, surprisingly, the term noon wasn't always shorthand for midday at 12:00; in fact, it used to refer to a different time of day altogether. First, some history. Clocks and watches are relatively new inventions.

The phrase "until noon time" is correct and usable in written English. You can use it when referring to a time frame that ends at noon. For example: "We need to finish this project before noon time.". exact ( 1 ) The training was scheduled in the morning until noon time (8.30 a.m. to 1.30 p.m).