Ah, let me guess, the date numbers are right, it's actually the order of the numbers that has been confused - this is because different countries have different orders in how dates are written. The USA writes dates as month, day, year, where as the UK and Australia (the later where I live) writes dates as day, month, year (And Japan writes it as Year, day, month). So it's likely you've gotten the order wrong for the site, which is using the US way of writing dates.

Put the first number as the month and the second number as the day, instead of the other way around, and it should work now (I just checked the date settings under my profile and it indeed lists the month first and then day and year, but also it clearly identifies them as such).