With zsh:
autoload age
ls -ldrt -- **/*(e{age 2013/03/06:13:20:00 2013/05/18:11:00:00})
See:
info -f zsh --index-search=age
for details.
(note that it will be a lot less efficient than Anthon's GNU find solution as it will parse those dates, do 2 lstats for every file and sort the list of files (you can avoid that last part by adding oN to the list of globbing qualifiers; use D to include dotfiles)).