Pinpointing Christ's Birth Date

[Beshara]

Hello

Thanks too much for providing the Orthodox Church timescale…

By neglecting the 8 years made by Dionysius Exiguus in determining the year of Christ's birth ,we find that christ's age on the earth is 31 years and this is differ from our informations that’s Christ's incarnation last 33 years.????

Is there any clarification about this notice

In Christ