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.

nDec ,
    sepStyle,
    negStyle ,
    currStyle ,
    strCurrency ,
    bCurrencyPrepend 
  ) {
    const event = globalThis.event;
    let value = this.AFMergeChange(event);
    if (!value) {
      return;
    }
    value = value.trim();
    let pattern;
    if (sepStyle > 1) {
      
      pattern = event.willCommit
        ? /^[+-]?(\d+(,\d*)?|,\d+)$/
        : /^[+-]?\d*,?\d*$/;
    } else {
      
      pattern = event.willCommit
        ? /^[+-]?(\d+(\.\d*)?|\.\d+)$/
        : /^[+-]?\d*\.?\d*$/;