[the earlier version of this that went out was a "draft" that accidentally went live instead of this version]
Remember that the month of Xber is actually October. Tip of the day readers familiar with their calendar history will know that X is the Roman number for ten and that the prefix "oct" means 8. That's because before the calendar change of 1752, March was the first month of the year, making October the eighth month and not the tenth month. Chances are after the calendar change of 1752, Xber refers to December and that before the calendar change of 1752 it referred to October.
Best advice: Record the month EXACTLY as written. If your software program doesn't "like "Xber" then personally, I would leave the date blank and record an EXACT transcription in my notes as to the date, but that's just my preference. And if the records being used are chronological, look at later entries in the year. It might also be good to look at earlier entries as well.