How logic alone may prove that time doesn’t exist

Modern physics suggests time may be an illusion. Einstein’s theory of relativity, for example, suggests the universe is a static, four-dimensional block that contains all of space and time simultaneously – with no special “now”.

What’s the future to one observer, is the past to another. That means time doesn’t flow from past to future, as we experience it.

This clashes with how time is conceptualized in other areas of physics, such as quantum mechanics, however. So is time an illusion or not?