Well, no, pulsars periods drift due to change of alignment and emission process over time. Thought special and general relativity will drive any "global/solar s

Well, no, pulsars periods drift due to change of alignment and emission process over time. Thought special and general relativity will drive any "global/solar system/galaxy"-wide precise time useless on long term anyway. The best is to keep track of long enough common measures ("day", "month") with decimal/fractions being connected to actual local times.