How Do I Serialize DateTime Objects in .NET in a Standards Compliant Way
My goal is use the .NET DateTime object (in C#) and have that be serialized to and parsed from a string (for use in XML) in a way that is standards compliant. The specific standard I have in mind is the ISO 8601 standard for representing dates and times.
I want an easy to use solution (preferably, one method call each way) that will convert to and from the concatenated version of the format. I would also like to preserve local time zone information.
Here's an example of the sort of string I'd like to get:
2009-04-15T10:55:03.0174-05:00
My target .NET version is 3.5.
I actually found a solution to this problem several years ago which involves a custom format and the DateTime.ToString(string) method. I was surprised that a simpler standards compliant solution didn't exist. Using a custom format string to serialize and parse in a standards compliant way smells a little to me.
Fortunately, there is XmlConvert.ToString() and XmlConvert.ToDateTime() which handles this format:
string s = XmlConvert.ToString(DateTime.Now,
XmlDateTimeSerializationMode.Local);
DateTime dt = XmlConvert.ToDateTime(s,
XmlDateTimeSerializationMode.Local);
(pick your appropriate serialization-mode)
dateobj.ToString（“s”）将为您提供符合ISO 8601的字符串表示形式，然后可以使用DateTime.Parse（）进行反序列化
It looks like .NET has improved a little in this regard over the past few years. The System.Xml.XmlConvert object seems to be designed to address a whole class of needs that appear in this context. The following functions appear to be designed specifically to address conversion of DateTime objects in a flexible and standards compliant way.
XmlConvert.ToDateTime(string, System.Xml.XmlDateTimeSerializationMode)
XmlConvert.ToString(DateTime, System.Xml.XmlDateTimeSerializationMode)
The following enumeration member seems especially useful in the case that you want to preserve the original time zone information:
System.Xml.XmlDateTimeSerializationMode.RoundtripKind
Here are links to documentation for the functions on MSDN:
XmlConvert.ToDateTime(string, System.Xml.XmlDateTimeSerializationMode)
XmlConvert.ToString(DateTime, System.Xml.XmlDateTimeSerializationMode)
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