Actually, science has placed no date on a global flood, as there has been no scientific evidence for such an event at the appropriate time. Hydrology, geology and other sciences don't come into play.
The date of the global flood, as estimated by biblical scholars, is given variously as:
2252 BC -- layevangelism.com
2304 BC -- Answers in Genesis (+/- 11 years).
2350 BC -- Morris, H. Biblical Creationism. Grand Rapids, MI: Baker Books, 1993.
2370 BC -- TalkOrigins.com
2500 BC -- http://www.nwcreation.net/biblechrono.html
2522 BC -- Dr. Gerhard Hasel
2978-3128 BC -- http://www.asa3.org/archive/ASA/199605/0162.html
3300 BC -- http://www.biblediscoveries.com/flood1.html
3537 BC -- Setterfield (1999)
The most common date is in the range of 2300-2350 BC, so I used 4300 years ago in my post #252.
To repeat the point of that post, the genetic continuity from 10,300 years ago to living individuals that has been documented in the western US agrees with other evidence that there was no global flood at about 4300 years ago.
Various non-biblical scholars have offered their estimates too. Cremo, Hancock, et. al. and I still have no definite opinion about the dates. They are all best guesses when looking at it from a scientific standpoint. As with geology, there are plenty of signs of hydrological movement but it cannot be put into an all encompassing nice, neat order on a global scale. That is part of the problem for deluvian modelers, self inclined. It's part of the passion I have for the related field works. I jsut wish we could get all the raw data and not have to work from the sieves of Nature and other peer-reviewed journals. That info is cleaned, scrubbed and sanitized. IMO