Flood Timeline

Name	0 to 100	101 - 200	201 - 300	301 - 400	401 - 500	501 - 600	601 - 700
Adam	A	A	A	A	A	A	A
Seth		130	B	B	B	B	B
Enosh			235	C	C	C	C
Kenan				325	D	D	D
Mahalalel				395	E	E	E
Jared					465	F	F
Enoch							627
Methuselah							692
Lamech
Noah
Ham, Shem, Japheth
Note:  Both Lamech amd Methuselah were alive when the ark was started.  Methuselah was alive until the year the flood started.
Both Lamech and Methuuselah knew what was coming, may actually have helped with the ark and knew their children were the unrighteous ones who would be drowned.
This starts at year 0. There is no BC, AD, BCE or CE used or intended. These are simply years from year 0.
The length of the year has not changed, That is the year has been 365.25 days long starting at year 0 and all years subsequent to that.

701 - 800	801 - 900	901 - 1000	1001 - 1100	1101 - 1200	1201 - 1300	1301 - 1400	1401 - 1500
A	930
B	B	1042
C	C	C	1140
D	D	D	D	D	1235
E	E	E	E	E	1290
F	F	F	F	F	F	F	1427
G	G	992
H	H	H	H	H	H	H	H
	879	J	J	J	J	J	J
			1061	K	K	K	K
1501 - 1600 1601 - 1700 H 1661 J 1656 ARK STARTED IN 1541 FLOOD STARTED IN 1661 1561