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Look, the only time travel metric for how far back or forward you've gone is one that is relative to the time/date/year you left.
BC/AD is not universal, and any attempt to set a universal measure would have to agree on a starting point.
This way, you could travel and know it's T minus 1200, or T plus 100. A fellow traveler might describe themselves in your time as T-50, for which you flip the sign and know for certain it's T+50 to you.
None of this Gregorian calendar nonsense. :-)

@emanate I didn't think this one through very well, mostly just wanted to rant about the Gregorian calendar.

Maybe I should have put it on my...AD account. :-P

@emanate This still relies on us all agreeing on a unit of measure!

@IrisKalmia It's true. One cycle around the sun, and smaller divisions, perhaps. There's never gonna be an absolute.

I've seen some sci-fi though offer "seconds" as a measure. Tying the second somehow into vibrating hydrogen or something. There's still going to be a metric, I just wanted to rant about AD/BC for a bit. :-P

@emanate Oh yeah! I've also seen some based around Planck Time, it's just a fun question to me

@emanate What if the invention of time-travel is itself so universally groundbreaking that the day the first successful leap occured becomes the new "year zero" for measuring dates going forward?

@emanate I like your idea too! The notion of a non-Gregorian calendar is neat, like measuring time in Swatch beats.

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