Gregorian Calendar switch

In the UK the switch to the Gregorian Calendar was in 1752 and the changeover was complex. Unfortunately Informix doesn't understand this at all and orders dates prior to this incorrectly as well as accepting dates that did not exist (Half of september ws actually missing). Is there any way of getting Informix to understand dates prior to 1752 as being part of the Julian Calendar as used in Britain with year ends in March.