A default date/time value must conform to the short format for the locale specified for the date/time field. However, by default, LiveCycle Designer ES displays the default value in the medium locale format at both design time and run time.
For example, consider a form with a Date/Time Field set to use the German (Germany) locale. You enter the default value for a date in the short format DD.MM.YY. After you change the focus to another field, the value specified in the field on the page is displayed in the medium format DD.MM.YYYY. The formatted value also appears in the medium format if you view the form in the Preview PDF tab.
Note:
At run time, by default, form fillers must edit the value of date/time fields using the short format for the locale specified for the field. If you specify an Edit Pattern on the Edit tab in the Patterns dialog box (Field tab > Patterns), that pattern overrides the short format, and users must enter data that conforms to the Edit Pattern.
Numeric Field or Decimal Field
A default numeric value can be any integer or any decimal number that contains a single radix point. The radix character can be either a “.” (period) or “,” (comma) depending on the locale selected. Thousands separators (or grouping symbols) and currency symbols are not valid as part of the default value.
For example, if a numeric field is set to the locale English (USA), and you specify the default value $1,234.56, both the currency symbol “$” (dollar sign) and the thousands separator “,” (comma) are not valid.
See also

Defaults for value formatting