There’s another fun thing we can call the Britain test. The short form for September is Sept in en-GB, the only month abbreviated with four letters. It’s Sep i

There’s another fun thing we can call the Britain test. The short form for September is Sept in en-GB, the only month abbreviated with four letters. It’s Sep in en-US and other en- locales. All other parsing is identical. For example, if you’re parsing abbreviated date formats on AWS, this parsing fails only on eu-west-1 and -2 servers, and only in September.