.NET 3.5 JavaScriptSerializer and DateTimeOffset serialization

.NET 3.5 JavaScriptSerializer and DateTimeOffset serialization

I have this class:
private class SimpleClass
{
public DateTimeOffset Date;
}
And when I try to serialize it by JavaScriptSerializer on .NET 3.5 result
is following JSON:
"{\"Date\":{\"DateTime\":\"\\/Date(1377674408500)\\/\",\"UtcDateTime\":\"\\/Date(1377674408500)\\/\",\"LocalDateTime\":\"\\/Date(1377674408500)\\/\",\"Date\":\"\\/Date(1377640800000)\\/\",\"Day\":28,\"DayOfWeek\":3,\"DayOfYear\":240,\"Hour\":9,\"Millisecond\":500,\"Minute\":20,\"Month\":8,\"Offset\":{\"Ticks\":72000000000,\"Days\":0,\"Hours\":2,\"Milliseconds\":0,\"Minutes\":0,\"Seconds\":0,\"TotalDays\":0.083333333333333329,\"TotalHours\":2,\"TotalMilliseconds\":7200000,\"TotalMinutes\":120,\"TotalSeconds\":7200},\"Second\":8,\"Ticks\":635132784085002695,\"UtcTicks\":635132712085002695,\"TimeOfDay\":{\"Ticks\":336085002695,\"Days\":0,\"Hours\":9,\"Milliseconds\":500,\"Minutes\":20,\"Seconds\":8,\"TotalDays\":0.38898727163773145,\"TotalHours\":9.3356945193055552,\"TotalMilliseconds\":33608500.2695,\"TotalMinutes\":560.14167115833334,\"TotalSeconds\":33608.5002695},\"Year\":2013}}"
And it is not possible to deserialize the result.
When I do the same with .NET 4.0 result is just:
"{\"Date\":\"\\/Date(1377675074146)\\/\"}"
And it is possible to deserialize this result.
This causing me big problem because I have client side which is written in
.net 3.5 and I need to deserialize result on the server side written in
.net 4.
Just to be complete here is the code for serialization and deserialization:
JavaScriptSerializer serializer = new JavaScriptSerializer();
DateTime dt = DateTime.Now;
SimpleClass instance = new SimpleClass();
instance.Date = dt;
string jsonStr = serializer.Serialize(instance);
SimpleClass newInstance = serializer.Deserialize<SimpleClass>(jsonStr);
Thanks for any ideas.