Last updated Sun Oct 3 08:01:01 2010
This page is intended to help decide on a __FreeBSD_version value to use for changes that are unrelated to the original reason for bumping. To find the original reasons, check out the CVS log for sys/param.h.
To use this page, find the date of the relevant change, then pick the __FreeBSD_version value corresponding to the next date after the change.
This is similar info to the porter's handbook section on versions, except that this table includes the dates in order to assist in picking a version number to use for an unrelated change.