To calculate time in the past from x minutes, subtract x minutes from the current time. For example, if it is currently 3:00 PM and you want to find the time 30 minutes ago, subtract 30 minutes from 3:00 PM. The result would be 2:30 PM.

The basic concept is to work with the current time and go back the number of minutes specified. By deducting x minutes from the current time, you can determine the time in the past. This method applies to all time-related calculations, providing a simple yet effective way to navigate time conversions.

Remember, when calculating time in the past from x minutes, ensure that you adjust for hours if the subtraction of x minutes causes the time to go back to the previous hour. Always keep track of both hours and minutes to accurately determine the time in the past from the given number of minutes.