Well I started logging mid-year, having first observed this rule - which it turned out that everyone had forgotten about.
in the spirit of 'challenge' - you have to announce your first ride before you do it, otherwise you are playing safe!
Other people have also joined in mid year.
If you start logging in Feb, no problem. But when it comes to December you won't have 2015 bragging rights, cos you won't have done the whole year.
But if you miss a month, I don't know whether you should drop out until the start of next year. Maybe so, otherwise this just becomes the "100k ride when I fancy it" log thread. Although that's not necessarily a bad thing.
I know the
imperial thread is really strict about calendar years and stuff, but they are all super tuff and eat barbed wire for breakfast.