wordmage: Pen nib with a paw print (SWTOR)
This is a combination and reworking of two posts I'd originally put up on my Revan blog, here and here, to help keep track of and explain the way different eras relate. Most notably, the Prequel, Original Trilogy, and Old Republic Era.

Terms to be familiar with:

  • Galactic Standard Calendar, also known as the “Coruscant Standard Calendar” or simply the “calendar” within the Republic, this widely used means of measuring time “universally” was based off of the solar cycle of Coruscant. This time period provided a year of 368 days, each day lasting 24 hours.
  • Calendar Eras, or simply eras, were a means used by historians to further split up the timeline relative to significant events.
* BTC and ATC (before the Treaty of Coruscant/after the Treaty of Coruscant) were the common measurements used in the Old Republic Era, as seen in SWTOR.
* BBY and ABY (before the Battle of Yavin/after the Battle of Yavin) are measurements noted in the later movie timelines, in recognition of the initial destruction of the Death Star.

According to supplementary materials, the smaller units of time are as follows:

  • 60 seconds = 1 minute
  • 60 minutes = 1 hour
  • 24 hours = 1 day
  • 5 days = 1 week
  • 7 weeks (35 days) = 1 month

Getting to the total of a year is harder than one would like, however. Put simply:

  • 1 year = 10 months + 3 festival weeks + 3 holidays

How that works specifically, that those three weeks and three days are not considered a part of any single month, is not clear, but that gives the basic layout of time measurement in the Star Wars Universe.

Granted, I'll come back and look at this again later, much more clearly I'm sure. But for now, this is a good start for the minute times.

Part two is especially useful if you like multiple eras. Myself, I prefer the Old Republic Era, so to reference for the more "popular" times there is a bit of math involved.

In the Old Republic timeline, the 
Treaty of Coruscant was so significant that it became year “0” and time was then calculated as events before the treaty (BTC) and after (ATC) - this was not, however, the last time that such a recalculation was made.

The 
Battle of Yavin during the Rebellion Era was another reset, becoming “year 0” with before (BBY) and after (ABY) which are the more common timeline measurements for general Star Wars things that focus on the movies and novels around or after that time.

However, given this is a Revan-centric blog, I find it necessary to post up a conversion between the two. Simply put, the Treaty of Coruscant is 3653 BBY. Therefore, the Battle of Yavin is 3653 ATC. So the initial math, where “X” is the years before or after the Treaty of Coruscant, looks like this:

  • If “X” is BTC, then X + 3653 = BBY
  • If “X” is ATC, then 3653 - X = BBY

Of course, if you want to do it in reverse and figure out how to turn the dates based on the Battle of Yavin into the Old Republic Era, it’s just a bit more complicated.

  1. If “X” is BBY, then 3653 - X
    • If your answer is a positive, you are in ATC. If your answer is a negative, you are BTC.
  2. If “X” is ABY, then 3653 + X

For examples we will take the following two events:

  • 303 BTC - The Jedi Civil War (KotOR)
    • To turn 303 BTC into ___ BBY, use the “X + 3653 =” equation; if X = 303, 303 + 3653 = 3656
    • 303 BTC = 3656 BBY
  • 32 BBY - The Blockade of Naboo (The Phantom Menace)
  • To turn 32 BBY into ___ ATC, use the “3653 - X” equation; if X = 32, 3653 - 32 = 3621. Because 3621 is positive, you are after the Treaty
  • 32 BBY = 3621 ATC

And that is how you convert dates between the Old Republic and Rebellion Eras. *Special thanks to my friend (askshivanulegacy on Tumblr/CSKazaam on Ao3) for helping check the math.*

Very, very useful. Especially if I get around to some of the writing I plan to...


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