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.

if (pdf >= 0 && pdf < this._dateFormats.length) {
      this.AFDate_FormatEx(this._dateFormats[pdf]);
    }
  }
  AFDate_KeystrokeEx(cFormat) {
    const event = globalThis.event;
    if (!event.willCommit) {
      return;
    }
    const value = this.AFMergeChange(event);
    if (!value) {
      return;
    }
    if (this._parseDate(cFormat, value) === null) {
      const invalid = GlobalConstants.IDS_INVALID_DATE;
      const invalid2 = GlobalConstants.IDS_INVALID_DATE2;
      const err = `${invalid} ${this._mkTargetName(
        event
      )}${invalid2}${cFormat}`;
      this._app.alert(err);
      event.rc = false;
    }
  }
  AFDate_Keystroke(pdf) {