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According to the manual, PHP uses the Unix Epoch (00:00:00 UTC on 1 January 1970) to generate its timestamps.
Given this definition, I believe that it is reasonable to work with negative timestamps, when the target date is before the Unix Epoch. But, since time is a complicated matter in programming, I want to know if there is any caveat in using negative timestamps in PHP.
Indeed, you’re absolutely right. Negative numbers is just the amount of seconds before the Unix Epoch.