Oops when clicking on calendar (UK date formats)

I get "Oops! Please try again in a moment — the antacids should have taken effect by then...." when I click on a date on the calendar.

I noticed the date in the URL is then in UK format, for example http://iwantsandy.com/digest?date=14/... If I manually change the URL to US format (http://iwantsandy.com/digest?date=5/1...) I then get the desired page.

I think there is some odd locale stuff going on here.
 
sad I’m frustrated
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