[R] Ordering List Items Chronologically

[Simon Kiss]

Dear colleagues,
Is there a way to order list items by date? I have a series of surveys in a list where the name of each list item is the date the survey was taken but the list items are out of order.  Each data frame has a variable in it with the survey date as well, if that helps.
Yours, Simon Kiss
#Sample Data
mylist<-list('1991-01-01'=data.frame(a=rep(5,5), survey.date=rep(as.Date('1991-01-01', format='%Y-%m-%d'))), '1979-01-01'=data.frame(aa=rep(5,5), survey.date=rep(as.Date('1979-01-01', format='%Y-%m-%d'), 5)), '2001-01-01'=data.frame(c=rep(6,5), survey.date=rep(as.Date('2001-01-01', format='%Y-%m-%d'), 5)))
mylist