The whole "BSC" and "SC" timeline has been bugging me for awhile, because it is contradicted multiple times in the books and because the "0 SC" date is nowhere near any significant events.
I've created a new timeline for the wiki - see Enderverse Timeline for the specifics. This one is much easier to date from than the old calendar.
While you are editing pages, please take the time to convert a calendar date to the new timeline if you have the chance, or add a date if there is not one to begin with.
Hopefully this will lead to the wiki having a better-structured timeline page and for article pages to have more dates.