Was reading recently that our seasons are so out of line with what they used to be 400 years ago that to bring them back in line we would have to re-date the calender by minus 10 days.
In other words, to have winter truly begin on 21st December, (winter solstice), we would now be needing to date our correspondence as 11/12/2013.
So all those micro seconds do add up over time.
I've been maintaining this for years. When I was a young child, I seem to remember some Christmases being 'white'. These days, they are usually more like an autumn day.
Also, summer (such as it is) seems to go on well into October in some years, and March and even April often feel like midwinter.
I propose that we have Christmas this year and then turn the calendar back one month... so we can have Christmas all over again!