Why AM/PM is a bad idea:

- It's more complicated.
- Is 12:00 PM in the morning or evening? I don't know.
- 12:00 PM followed by 12:01 AM, WTF?
- Which date does 12:00 PM belong to?

Benefits of 24-hour clock:

- Simple, hours run from 00 to 23.
- 12:00 is noon.
- 00:00 is midnight of the subsequent day
- 24:00 is the exact same time, but on the previous day

Thus, it's obvious what point in time I'm referring to when I say 7'th Oct 00:00.

Now, let's fix DST.