parse with format "yyMd" gives unexpected result

I’m unsure if my expectations are off but when I parse the string “2211” and “2212” using format “yyMd” I don’t get a valid date. “2213” works.

  const actualDate = parse("2211", "yyMd", new Date());
  console.log(actualDate.toString());
  //Invalid Date

  const expectedDate = new Date("2022-01-01");
  console.log(expectedDate.toString());
  //Sat Jan 01 2022 01:00:00 GMT+0100 (Central European Standard Time)

[Alanscut]

my point is this is just an accepted side effect of using a “fuzzy” format like yyMd, this is just my personal opinion，maybe we should @ the member of this lib to confirm the situation

[nicklasisraelsson]

Yeah I agree that the yyMd format is probably prone to these errors.

I was however surprised that parse rather choose to return an invalid date since it can match 11 to a month with no day and didn’t try matching the 11 to January 1st.