dst

Daylight Saving Time

ID: dst

Difficulty: 2.2

CPU Time: 1 second

Memory: 1024 MB

Solution

For a forward change, simply add D to M, and then, to represent the hours crossed, add M / 60 to H. For a backward change, decrement M by 60, and while M < 0, add 60 to M and decrement H by 1. After that, add 24 to H while it is negative. Finally (for both forward and backwards changes) to bring the new values into valid ranges, use modulo division, outputting H % 24 and M % 60.