In general, there is a difference between the common spoken ordering of dates between US and UK usage. So in the UK, we would tend to say:
"the 14th of December, 2005"
while in the US, people would tend to say:
"December 14th, 2005"
The US ordering is possible in spoken usage (usually with "the", so "December the 14th, 2005"), but probably not the most common in spoken usage, and definitely not in written usage. In written UK usage-- at least in a modern written style-- one would tend to write: "14 December 2005".
Now my question: how jarring does it look to a native US speaker to write dates using the UK format, i.e. "14 December 2005"? Visually, I quite like the UK style because it keeps the two numbers separated, but the document I'm writing is for a US audience.