Patrick (then known as Maewyn Succat) was born between 387 and 390 AD.
He was born in/about 387 AD.
Saint Apollinaris the Apologist was born sometime in the 2nd century AD.
Saint Genevieve lived in the 5th century AD.
BC. He was born in 570 BC.
Joseph was born about the middle of the first century BC. and died before 30 AD. No dates are known.
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We have no dates but Mary was probably born about 15 BC and died sometime in the second half of the first century AD.
BC is the time before jesus christ was born therefore BC is BEFORE CHRIST and AD refers to the time after christ was born
Peter was probably born about the year AD1. The date is unknown.
There was no period between BC and AD. One followed the other. After 1 BC was the year 1 AD. There was no year zero or anything else between BC and AD. BC is Before Christ. AD is Anno Domini, the time of Our Lord, so basically from when he was born. So there is no time period in between before he was born and when he was born.