C# - Cannot deserialize to string

I'm writing a method to deserialize from .xml file to object. I've got the inner exception that invalid string format to parse from string to Datetime at (7,6) in the xml file:

<Time>22/12/2014 21:07:44</Time>

However, there's no Datetime field in my class:

public string Time { get; set; }

Here's my code for deserializing:

var serializer = new XmlSerializer(typeof(Order));
Order order;
using (TextReader reader = new StreamReader(filePath))
{
      order = (Order)serializer.Deserialize(reader);
}

I can't understand why the exception occurs...