When does the below equation be correct?

1300 + 20 = 1400 - 40

1300 + 20 = 1400 - 40 Trick Equation

In a clock.

1300 + 20 = 1:00PM + 20 minutes = 1:20 PM
1400 - 40 = 2:00PM - 40 minutes = 1:20 PM