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Added the deserialize fix and test for the UTC DateTime #613

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merged 3 commits into from Jun 12, 2021

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gjdonkers
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Deserialize the datetime to correct timezone as described on the Microsoft documentation for the "o" Roundtrip

// The example displays the following output:
//    6/15/2009 1:45:30 PM (Unspecified) --> 2009-06-15T13:45:30.0000000
//    6/15/2009 1:45:30 PM (Utc) --> 2009-06-15T13:45:30.0000000Z
//    6/15/2009 1:45:30 PM (Local) --> 2009-06-15T13:45:30.0000000-07:00

https://docs.microsoft.com/en-us/dotnet/standard/base-types/standard-date-and-time-format-strings#Roundtrip

value = DateTime.Parse(scalar.Value, CultureInfo.InvariantCulture);
var style = scalar.Value.EndsWith("Z")
? DateTimeStyles.AdjustToUniversal | DateTimeStyles.AssumeUniversal
: scalar.Value.Length > 27 ? DateTimeStyles.AssumeLocal : DateTimeStyles.None;
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Testing the length seems a bit fragile. Maybe a regex would be more robust?

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I don't have the skills to create a good regex for this, so I don't know if it would be more robust. The previous implementation is still the same, DateTimeStyles.None is the default. And the 'o' roundtrip is compliant with the ISO 8601, so I thought this won't break other implementations but would only add the correct TimeZone if this is known.

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I know you are a busy man at the moment but is there a chance we can resolve this? What kind of regex are you thinking of?

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I'm sorry, I haven't had much free time. I made some experiments and it seems that instead of forcing the adjustment, you can simply pass the DateTimeStyles.RoundtripKind value to the style and you will get the correct kind. Have you tried that instead?

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Ah.. I've overlooked that one, that is definitely a better solution.

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I think you can always use the DateTimeStyles.RoundtripKind, without any test:

value = DateTime.Parse(scalar.Value, CultureInfo.InvariantCulture, DateTimeStyles.RoundtripKind);

@aaubry
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aaubry commented Jun 12, 2021

Thanks for this and sorry about the slow response time.

@aaubry aaubry merged commit 3bea68e into aaubry:master Jun 12, 2021
@gjdonkers
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No problem. I’m glad it’s fixed.

@gjdonkers
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One question, when do you think this will be released to the latest nuget?

@aaubry
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aaubry commented Jun 13, 2021

This feature has been released in version 11.2.0.

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2 participants