In The Mandalorian, it's said that the package that the Mandalorian is to pick up is "50 years old". Given how many different planets, stars, etc. there are in the Star Wars universe, what is the "baseline" for a Year?
This discussion does point out that a "year" is certainly relative:
"Wait. They said fifty years old."
"Species age differently. Perhaps it could live many centuries."
- "The Mandalorian" and IG-11 upon discovering an infant of the species
I found a reference to a "Standard Year":
On Coruscant, a year was made up of twelve months[source?] spanning 365 days of 24 hours each, with no leap years. The galaxy used a standardized dating system based off of the galactic capital Coruscant. By the time of the New Republic, the Galactic calendar would use the Battle of Yavin as the epicenter on which to date years
So would it all, even in the time-frame of the Mandalorian, and beyond, still be a Corsucantian year?