How to get error details from UpdateListItems SOAP response? - sharepoint

Question

I'm writting an iOS-client for Microsoft SharePoint. My goal is to update a datetime field of a list item and get details on errors. I have a datetime field with custom server-side validation.
Here is a request to /_vti_bin/Lists.asmx:
<?xml version="1.0" encoding="utf-8"?>
<soap:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
<soap:Body>
<UpdateListItems xmlns="http://schemas.microsoft.com/sharepoint/soap/">
<listName>{405FFE91-946E-4B2F-861E-DDB24F1629F2}</listName>
<updates>
<Batch OnError="Continue" ListVersion="1">
<Method ID="1" Cmd="Update">
<Field Name="ID">1</Field>
<Field Name="DateTime_x0020_E">2000-08-08 07:00:00 +0000</Field>
</Method>
</Batch>
</updates>
</UpdateListItems>
</soap:Body>
</soap:Envelope>
Here is a response:
?xml version="1.0" encoding="utf-8"?>
<soap:Envelope
xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<soap:Body>
<UpdateListItemsResponse
xmlns="http://schemas.microsoft.com/sharepoint/soap/">
<UpdateListItemsResult>
<Results>
<Result ID="1,Update">
<ErrorCode>0x8102001c</ErrorCode>
<ErrorText>Invalid date/time value.
A date/time field contains invalid data. Please check the value and try again.</ErrorText>
<z:row ows_ContentTypeId="0x0100D3AA6E2413CF1645A9101D3421B797AE" ows_Title="test of time" ows_DateTi... skipped...
This response doesn't say anything about valid range of this field. However, when I try to set invalid date at SharePoint site, I get proper error:
Q: how to get details on error using SharePoint SOAP service?

Answer 1

I've found out where is my mistake. The field is date-only, so probably SharePoint doesn't accept value as 2000-08-08 07:00:00 +0000. When I send date only:
<Field Name="DateTime_x0020_E">1995-08-08</Field>
I get the proper error text:
<Result ID="1,Update">
<ErrorCode>0x810200c5</ErrorCode>
<ErrorText>[DateTime E] - [Date should be after July 1, 2007]</ErrorText>
...
</Result>