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.

action: (value, data) => {
            data.minutes = parseInt(value);
          },
        },
        M: {
          pattern: "(\\d{1,2})",
          action: (value, data) => {
            data.minutes = parseInt(value);
          },
        },
        ss: {
          pattern: "(\\d{2})",
          action: (value, data) => {
            data.seconds = parseInt(value);
          },
        },
        s: {
          pattern: "(\\d{1,2})",
          action: (value, data) => {
            data.seconds = parseInt(value);
          },
        },
        tt: {
          pattern: "([aApP][mM])",
          action: (value, data) => {
            const char = value.charAt(0);
            data.am = char === "a" || char === "A";
          },
        },
        t: {