This happens because satellites are in motion relative to the planet so the observers on the planet will perceive time is passing more slowly for the satellites. Daylight saving time DST , also summer time in British English, is the convention of advancing clocks so that afternoons have more daylight and mornings have less. It is semantically equivalent to new Date. As a result, the first benchmark will have less CPU resources than the second. Therefore the maximum difference between 2 local times on Earth is 26 hours. Mon, 30 Jul UTC counts time using SI seconds, and breaks up the span of time into days. It is neither a linear representation of time nor a true representation of UTC though it is frequently mistaken for both as the times it represents are UTC but it has no way of representing UTC leap seconds e. UTC is a universal time keeping standard by itself. Date auto-corrects itself when out-of-range components are set.