If you have a unix timestamp, which is what eZ publish uses to store dates, you can display this using the l10n() operator. E.g.
{$time_stamp_value|l10n(date)}
{$time_stamp_value|l10n(datetime)}
{$time_stamp_value|l10n(shortdate)} {$time_stamp_value|l10n(time)}
This will display the data according to your locale settings.