XmlDateTimeSerializationMode
Specifies how to treat the time value when converting between string and DateTime.
Local = 0
Treat as local time. If the DateTime object represents a Coordinated Universal Time (UTC), it is converted to the local time.
RoundtripKind = 3
Time zone information should be preserved when converting.
Unspecified = 2
Treat as a local time if a DateTime is being converted to a string.
Utc = 1
Treat as a UTC. If the DateTime object represents a local time, it is converted to a UTC.