public class TestModel
{
    [Display(Name = "Montant")]
    [DisplayFormat(DataFormatString = "{0:C2}")]
    public Decimal Amount
    {
        get;
        set;
    }

    [Display(Name = "Date d'achat")]
    [DataType(DataType.Date)]
    public DateTime Date
    {
        get;
        set;
    }
}

TestModel model = new TestModel
{
    Amount = 1234.333M,
    Date = DateTime.Today.AddDays(-10)
};

@Html.DisplayFor(x => x.Amout)   => "1 234,33 €"
@Html.ValueFor(x => x.Amount)    => "1234,333"

@Html.DisplayFor(x => x.Date)    => "23/03/2014"
@Html.ValueFor(x => x.Date)      => "23/03/2014 00:00:00"

@Html.ValueFor(x => x.Amount) = Convert.ToString(x.Amount, CultureInfo.CurrentCulture)
@Html.ValueFor(x => x.Amount, "0.00") = String.Format(x.Amount, "0.00", CultureInfo.CurrentCulture)