Genealogies have never been used to calculate dates
The Bible clearly states when time spans are important
Exodus 12:40 ESV
The time that the people of Israel lived in Egypt was 430 years.
1 Kings 6:1 ESV
In the four hundred and eightieth year after the people of Israel came out of the land of Egypt, in the fourth year of Solomon’s reign over Israel, in the month of Ziv, which is the second month, he began to build the house of the Lord.
Judges 11:26 (ESV)
While Israel lived in Heshbon and its villages, and in Aroer and its villages, and in all the cities that are on the banks of the Arnon, 300 years, why did you not deliver them within that time?
Genealogies contradict each other
Matthew 1 and Genesis
Ezra 7 and 1 Chronicles 6
The Purpose of Genealogies
portray important elements about the following passage or books
the effects of sin
important people
important claims
To drive the narrative
To bridge gaps in narrative
Conclusion
The Bible is clear on the items we are to take as infallible
We need to appreciate the styles and forms that God prepared for us in the way they were intended