British journalists were apparently locked out of the White House on Friday amid confusion over the United Kingdom-style formats of their birthdates.

Unlike in the United States, where the month appears ahead of the day and year, most European dates are written with the day first, followed by the month and then year.

Several members of the press from across the pond tweeted about the apparent mixup, which came about an hour before British Prime Minister Theresa May was to appear at a White House press conference alongside President Trump.

British press corp is locked outside the White House because our birthdates were submitted in UK format and secret service don't get it. — Jim Waterson (@jimwaterson) January 27, 2017

White House press officer just told me off on the phone for laughing when they told me about not knowing British date formats were different — Ned Donovan (@Ned_Donovan) January 27, 2017

"Why is that funny? One person put their birthday as 01/08/[year], why would we be expected to think that means August 1st? Why?" — Ned Donovan (@Ned_Donovan) January 27, 2017

There was no immediate word Friday afternoon whether the issue had been resolved.