When doing nothing particularly constructive I came across the fact that Avril Lavigne is born the day before me (27-Sep-1984). Now I have been told by my mum that I was born at 1:10 am on the 28th. I dont know if there is some sort of universal time used for recording births for birth certificates or whatever.
However, due to the time difference between the UK and Canada (what is it ? about 5 hours for the East coast ?) I could be a few hours older than Avril if she was born after 8:10pm Canada time, but she will always be documented as being older.
I just thought this was neat.
Just another stoned thought…hmmm? 
Consider this, then - it’s possible for the younger of a pair of twins to have his or her birthday two, or even three days before the elder twin. I leave it as an exercise for the reader to work out how (relativistic time dilation is not required).
Definitely not the answer you’re looking for, but healthy twins have been born 56 days apart. So two or three days isn’t much of a stretch. 
Yeah, but the younger twin’s birthday still occurs after the elder one’s. Now, if they had been born 363 days apart you might be on to something.
Damn, missed that part.
I’m guessing the real solution involves crossing the international date line, possibly with a daylight saving switchover thrown in for good measure. My brain’s too dead at the moment to figure out the directions and numbers, though.
Crossing the international date line on February 29?
Other than that, I got nuthin’.
Crossing the international date line during the Gregorian calendar reform, which involved skipping 10-13 days?
Come on then Usram what is the answer? I think Scarlett67 is pretty close.
Very close. But you need to cross the date line in a non-leap year.
5 hours for the Eastern time zone (which is what you’re looking for - Avril’s from Ontario) 3.5 hours for the actual eastern end of the country, 4 for the rest of ‘the East Coast’.