public static DateTime?TryDateTime(object val, bool useCulture = true)
{
CultureInfo info = useCulture ? CultureInfo.CurrentCulture : CultureInfo.InvariantCulture;
if (val == null)
{
return(new DateTime?(DateTimeExtension.FromOADate(0.0)));
}
if (IsNumber(val))
{
if (val is DateTime)
{
return(new DateTime?((DateTime)val));
}
if (val is TimeSpan)
{
TimeSpan span = (TimeSpan)val;
return(new DateTime?(DateTimeExtension.FromOADate(span.TotalDays)));
}
double?nullable = TryDouble(val, useCulture);
if (nullable.HasValue)
{
return(new DateTime?(DateTimeExtension.FromOADate(nullable.Value)));
}
}
else
{
DateTime time;
if ((val is string) && DateTime.TryParse((string)(val as string), (IFormatProvider)info, (DateTimeStyles)DateTimeStyles.None, out time))
{
return(new DateTime?(time));
}
}
return(null);
}