How Many Hours Until 12 AM? The hours calculator will find the exact time between two times and calculate the hour differences for today or tomorrow.
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Using the same thinking as for PM, we all know that 1:00AM is in the morning. One minute before this must be 12:59 and as the sun is definitely before the meridian (ante meridien), so it is 12:59 AM. So, the early hours of the morning are 12:01-12:59AM and midnight is therefore 12:00AM.
12 a.m. is midnight, which is the beginning of the day. It marks the start of a new 24-hour day cycle. On the other hand, 12 p.m. is noon, which is the middle of the day. So, when the clock strikes 12 a.m., it’s officially the start of a new day, while 12 p.m. is the halfway point through that day.
‘Midnight’ refers to 12 o’clock during the night. Simple right? Well, maybe not, especially if you’re using a 12-hour clock. When most people say 12pm, typically they’re talking about the middle of the day: 12 noon.
Midday and midnight conventions
It is often said that 12am Monday is midnight on Monday morning and 12pm is midday. This puts all the times beginning with 12 and ending with am in the same one-hour block, similarly with those ending with pm.