"Friendly" should be invalid date, but it read as valid date

[elliotching]

"Friendly" should be invalid date, but it read as valid date

[sslincoco]

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[gilmoreorless]

The ddd at the start of the format string is looking for a day name. Since day names can be any string based on locale, I suspect it's treating "Friendly" as the name, then moving on to look for the other parts of the date. It doesn't find any and uses lenient fallbacks.

Trying to parse it without the format string, or with different format strings, produces the expected result:

moment("Friendly").toString();  // 'Invalid Date'
moment("Friendly", "YYYY").toString();  // 'Invalid Date'
moment("Friendly", "MMM DD, YYYY").toString();  // 'Invalid Date'