1999
I think it was 2009 since there were 5 Saturdays in that month October.
October 2010 contains 5 weekends.
because of leap years, October has 5 weekends alternating between every 6 years and every 11 years. The next Octobers with 5 weekends will be 2021 and 2027.
2010
If you mean five Fridays and Saturdays, the last two years that happened were 2010 and 2004.
2006.
3 months had five Sat-Sun weekends in 2011: January, July, and October.
October 2010
There are 14 calendar variations (7 days of the week plus leap years). Some years October will have 5 Fridays, 5 Saturdays, and 5 Sundays. October 1999, 2010, 2021, and 2032 all have 5 Fridays, 5 Saturdays, and 5 Sundays. This looks like an 11 year gap, but October 1988 and 2043 do not have 5 weekends.
Using MS Works calendar - the last time it happened was in 2004. The next time will be in 2021 !
2014
October 2010 July 2011
From the last Sunday of March to the last Sunday of October, 5 AM EST equals 9 AM BST in England. From the last Sunday of October to the last Sunday of March, 5 AM EST equals 10 AM GMT in England.