Guild Wars 2

On Friday, August 24th 2012, at 9:00 P.M. P.S.T. Anet brought the servers online 3 hours before the 3-day headstart weekend began.
At around 9:03 P.M. P.S.T., I started creating 5 characters, and finished by 10:30 P.M. Most of those were created to reserve my names from Guild Wars 1, and to obtain the one word names I valued.

Of those, one still exists as created on that date, and at that time. On August 24th, 2013, the character was shown as only being 364 days old. The character didn’t get her birthday present until the 25th of August. (I assumed that they simply didn’t count that 3 hour jumpstart.)

From Friday, August 24th 2012 through the headstart weekend, and well past, the Trading Post was up, down, or down for maintenance, almost all of the time.
On Wednesday August 29th 2012, I was able to purchase an extra character slot. That character still exists today. Upon checking for her birthday present on the 29th of August, she got none, and her age shows as 364 days.

As to how I know the creation dates?
My signature has a link to my user page on the GW2 wiki, where I post the date, along with all pertinent data, whenever I create a character, as well as why I rerolled a name, changed the race, or profession, etc.
(I even include data on the GW1 character that the name came from.)

Mine are off by 15 days on two characters.

I need to make a correction…
It seems that, unlike GW1, which counted days the way everyone else does, GW2 counts them down to the hours and minutes.
While I didn’t bother to check on the first character’s birthday at, or near, the hour that I created her (almost midnight my time) the one created on the 29th was created shortly after I came home from work. When I check on her at THAT time, she had her birthday present and is correctly aged 365 days.