I suppose your best way is to go back through the sections - either Q&P or Crosswords - until you get to ones asked on July 19. Here is a URL for earlier this month:
http://www.theanswerbank.co.uk/Quizzes-and-Puz zles/Questions20.html
type it in the address line above but change the figure 20 to 30 or 40 or something (ie that will the 30th or 40th page of questions) till you get the dates you want. Won't be quick but maybe quicker than doing it via the confounded search engine.