If the requirements include "keeping time with up-to-date knowledge of time zones without costing us money", guess what, the requirements now mandate a code cha

If the requirements include "keeping time with up-to-date knowledge of time zones without costing us money", guess what, the requirements now mandate a code change. Requirements may not change, but environments do, and continuing to meet requirements in the face of changing environments is something that will often mandate changing code or requirements. When the world shifts, something often has to shift along with it, lest the whole thing break.