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copied!<p>you could use a IValueConverter (which takes in a culture parameter) and format the value as you wish, something I like is this nullable converter by Matt Hamilton</p> <pre><code>class NullableDateTimeConverter : ValidationRule, IValueConverter { public override ValidationResult Validate(object value, CultureInfo cultureInfo) { if (value == null || value.ToString().Trim().Length == 0) return null; return new ValidationResult( ConvertBack(value, typeof(DateTime?), null, cultureInfo) != DependencyProperty.UnsetValue, "Please enter a valid date, or leave this value blank"); } #region IValueConverter Members public object Convert(object value, Type targetType, object parameter, CultureInfo culture) { if (value == null) return ""; DateTime? dt = value as DateTime?; if (dt.HasValue) { return parameter == null ? dt.Value.ToString() : dt.Value.ToString(parameter.ToString()); } return ""; } public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture) { if (value == null || value.ToString().Trim().Length == 0) return null; string s = value.ToString(); if (s.CompareTo("today") == 0) return DateTime.Today; if (s.CompareTo("now") == 0) return DateTime.Now; if (s.CompareTo("yesterday") == 0) return DateTime.Today.AddDays(-1); if (s.CompareTo("tomorrow") == 0) return DateTime.Today.AddDays(1); DateTime dt; if (DateTime.TryParse(value.ToString(), out dt)) return dt; return DependencyProperty.UnsetValue; } #endregion </code></pre> <p>} </p> <p>heres the <a href="http://www.madprops.org/blog/A-Nullable-DateTime-IValueConverter-and-ValidationRule/" rel="nofollow noreferrer">original</a> </p>

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