What is 21 hours from now is what time?

To determine the time 21 hours from now, you can add 21 hours to the current time. For example, if it is currently 3:00 PM, adding 21 hours would bring you to 12:00 PM the following day.

Alternatively, you could use a 24-hour clock to calculate the time. For example, if it is currently 15:00 (3:00 PM), adding 21 hours would bring you to 12:00 (12:00 PM) the following day.

It is important to keep in mind the current time and date when calculating 21 hours from now to ensure accuracy.