DateTime UTC marker

Because you are storing the date and time in UTC, all incoming dates would need to be "converted" to UTC time. For +01:00, this means adding on hour. For Z (Zulu Time) there is no time offset, so the time received is the time saved.

Hi probaly didnt explain it correct

In the database it' stored in local time. I'm in oslo so right now I'm +01:00.
But when  <ObsEnd>2015-10-23T02:18:58+01:00</ObsEnd>  (irish) came as a value
I was +02:00   and  the time in db was stored as 03:18 wich is correct local time in Oslo

And when <ObsEnd>2015-12-01T13:48:53Z</ObsEnd> came Oslo is +01:00
but hen tim in db is stored same as the value 13:48.
Since there is an hour time differnce I presumed it also would store this value as local time wich would be 14:48

Z assumes it is in the same time zone.  I.e. no conversion is needed.    
I.e. you were at +1 hour, then you 'fell back' for the time zone, and it went to +0.  
+0 gets converted to Z as well.  Since it is a standard for servers to run UTC time, this is typically not an issue.  

When you don't run your time zone as UTC, you run into that difference, where Z meaning don't change it, and Z meaning UTC time can hurt.

Please keep in mind that just changing your servers timezone is not necessarily safe.  I.e. depending on how things are recorded, all your database dates may then be off.  Logs may appear confusing, and communications with other servers may have issues.  It's always best to start a server in UTC time, but as it sounds like not, you need to be careful in fixing it.  

Here is a good article about UTC time.  - http://yellerapp.com/posts/2015-01-12-the-worst-server-setup-you-can-make.html

Hi
OK, sorry probaly som confusion here

I haven't changed the timezone on the server, the time has adjusted itself accordingly to daylightsavingstime.

I (the server in Oslo)  is +2 before 25october and + 1 after 25october (this changes again in march)
This Data that I recive is from Ireland and they are +1 pre 25th and z (+0) post 25th october

Pre 25th the service stored the data as local time, adding one hour to the data recived correctly
post 25th the service did not add 1 hour, and just stored the time as it recived it

No timezone's altered just daylightsavings adjusted.

It would appear that the time you are receiving from the web service is UTC/GMT time with timezone offset. So the time is being converted to the local time of the sender (Ireland), not the recipient (Norway).

Does your data records have audit fields with which you can confirm when you received the data in Oslo time?

yes, I record the time we revice the transaction/data in
Data recived time (oslo time)  is + 1hour from the time in the  Object Field <ObsEnd>

So it seems that the service converts the irish time right when it comes as
<ObsEnd>2015-10-23T02:18:58+01:00</ObsEnd>
And not when it comes as:
<ObsEnd>2015-12-01T13:48:53Z</ObsEnd>

I just wondered if .net framework 3.5 wich the service is created does not handle "z" correct.
Or if the error is pre this since the service recives data in xml, and deserialize it

Hi
Since the service recives an xml string and its Deserialized into an enity before I handle it, the error seems to be there.
I have done following testing (sorry for all the code)
I use deserilaze from this site
http://www.techillumination.in/2013/07/convert-object-to-xml-and-vice-versa.html

I am now in timezone +1 (oslo)

With z

       XmlDocument doc = new XmlDocument();
        XmlElement el = (XmlElement)doc.AppendChild(doc.CreateElement("pEnt"));
        el.AppendChild(doc.CreateElement("dato")).InnerText = "2015-10-29T17:47:37+z";

        XmlDocument doc2 = new XmlDocument();
        XmlElement el2 = (XmlElement)doc2.AppendChild(doc2.CreateElement("pEnt"));
        el2.AppendChild(doc2.CreateElement("dato")).InnerText = "2015-10-29T17:47:37+01:00";

        XmlDocument doc3 = new XmlDocument();
        XmlElement el3 = (XmlElement)doc3.AppendChild(doc3.CreateElement("pEnt"));
        el3.AppendChild(doc3.CreateElement("dato")).InnerText = "2015-10-29T17:47:37+02:00";

        pEnt sak = new pEnt();
        sak = (pEnt)ObjectToXML(doc.OuterXml, sak.GetType());
        pEnt sak2 = (pEnt)ObjectToXML(doc2.OuterXml, sak.GetType());
        pEnt sak3 = (pEnt)ObjectToXML(doc3.OuterXml, sak.GetType());
       
        DateTime local1 = DateTime.Parse("2015-10-29T17:47:37+z");
        DateTime local2 = DateTime.Parse("2015-10-29T17:47:37+01:00");
        DateTime local3 = DateTime.Parse("2015-10-29T17:47:37+02:00");

Gives:
DateTimeParse on string
29.10.2015 18:47:37      z
29.10.2015 17:47:37     +01
29.10.2015 16:47:37     +02
Deserialize
29.10.2015 17:47:37    z
29.10.2015 17:47:37  +01
29.10.2015 16:47:37   +


but if I change z With +00:00
I get the desired result:

DateTimeParse on string
29.10.2015 18:47:37
29.10.2015 17:47:37
29.10.2015 16:47:37
Deserialize
29.10.2015 18:47:37
29.10.2015 17:47:37
29.10.2015 16:47:37


So my conlusion is that I need to change the Field in the entity from datetime to string and the DateTime.Parse it or have the customer send in +00:00 instead

I will test this in my service, I have gotten the customer to send in +00:00 to start with