What time is midday on 24 hour clock?

1200 hrs.

There is no such corresponding time for midnight. Reason midnight could be either '0000' or '2400'. , but which day does it refer.

So midnight on the 24 hour clock does not occur.

You have either 2359 hrs (on a given day) or 0001 hrs. ( the next day), that is 2 minutes later. .