LOL. I have a good handle on how to do TBX/TBG calculations.I know that I leveled them the day they hit the new level. If they leveled during a combat, I would hold off on informing then until the end of combat. so if combat started on the 3rd, they leveled to 4 on the 6th, and combat ends on the 12th, you would do TBX till the 6th, and do the TBX from the 6th till the 12th with level 4th TBX
The day combat ends, is the day the level up is calculated from, even if you reached it via TBX in the middle, IIRC. Other wise it gets too messy.
What I don't have is the actual starting EXP for each of you and the dates you were eligible to level up. Of course, if Mowgli plugs you both into that handy calculation Excel spread sheet, we can save everyone calculator time. I can do it by hand too, if you guys have those dates (those are the key).
In my own games, I track that stuff all on the opening post, but the information is not easily found there at the moment with the changes.