Experience mismatched

Hello all,

I need a clarification that, during the CTC discussion with future employer HR I told that I have 2.10 years of experience and they've released the offer letter and now when I casually re-calculate my experience it is only 2.8 years, will that lead to any problem to my job during my induction and joining. Can someone please suggest!!

(Note: that 2.10 years exp I did not tell intentionally to the HR it came out of my mouth accidentally as I'm not aware about my exact months of exp)