For some people part of the 'New Year' ritual is to swap over their diary inserts. Taking out last years and inserting the next years.That said a lot of people do this on a rolling basis, archiving past weeks/months and adding in future weeks/months. They always keep 6-12 months in their organiser at any one time, with a split of say 3 months past and 9 months future, but the length of time