Hi pdfjs team,

Please find attach a really simple pdf file to reproduce the issue.
[Date.pdf](https://github.com/mozilla/pdf.js/files/8242310/Date.pdf)
This pdf contains 4 date fields, One with a default format (dd/mm/yyyy) and the 3 others with custom formats:

    -  dd
    -  mm
    -  yyyy

The expected behavior is that whenever I fill dd field with 16 for instance, then when i focus out that field the value displayed is 16 but I get 01.

This happens for dd field and mm but it's working fine for dd/mm/yyyy and yyyy fields.

The initial values of the pdf are properly displayed, this happens only if I focus one of those fields.

Thank you for your time

Best regards.

expect(send_queue.get(refIds[3])).toEqual({
          id: refIds[3],
          value: 1,
          valueAsString: "1",
        });
        await sandbox.dispatchEventInSandbox({
          id: refIds[1],
          value: "2",
          name: "Keystroke",
          willCommit: true,
        });
        expect(send_queue.has(refIds[3])).toEqual(true);
        expect(send_queue.get(refIds[3])).toEqual({
          id: refIds[3],
          value: 3,
          valueAsString: "3",
        });
        await sandbox.dispatchEventInSandbox({
          id: refIds[2],
          value: "3",
          name: "Keystroke",
          willCommit: true,
        });
        expect(send_queue.has(refIds[3])).toEqual(true);
        expect(send_queue.get(refIds[3])).toEqual({
          id: refIds[3],
          value: 6,
          valueAsString: "6",
        });
      });