The State Department has announced that it won’t be releasing a trove of Hillary Clinton’s emails until after the presidential election, but the day it plans to release them doesn’t actually exist.

International Business Times reported Monday that it had made a Freedom of Information Act request to the State Department for Hillary Clinton’s emails concerning the Trans-Pacific Partnership, a controversial free-trade deal. Initially, the State Department said those emails would be available by April 2016. After that deadline flew by with no emails in sight, the Department updated its prediction, saying the emails wouldn’t be available until an estimated date of Nov. 31, 2016.

[dcquiz] Besides shifting the email release date to after November’s presidential election, that date stands out for another reason: Nov. 31 doesn’t exist.

It’s not the first time there’s been a November dating goof in Washington. In 2002, the U.S. Capitol Historical Society printed over 650,000 calendars that mistakenly gave November a 31st day, which in turn threw off the entire month of December.

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