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

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Jun 12, 2021
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Merged

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

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5653d3c
Added the deserialize fix and test for the UTC DateTime
gjdonkers May 25, 2021
eb00bed
Replaced with `RoundtripKind` as suggested
gjdonkers Jun 10, 2021
a980a34
Tested best implementation of `DateTimeStyles.RoundtripKind`
gjdonkers Jun 12, 2021
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19 changes: 19 additions & 0 deletions YamlDotNet.Test/Serialization/DeserializerTest.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -19,6 +19,7 @@
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.

using System;
using System.Collections.Generic;
using FluentAssertions;
using Xunit;
Expand All @@ -34,6 +35,7 @@ public void Deserialize_YamlWithInterfaceTypeAndMapping_ReturnsModel()
{
var yaml = @"
name: Jack
momentOfBirth: 1983-04-21T20:21:03.0041599Z
cars:
- name: Mercedes
year: 2018
Expand All @@ -48,6 +50,13 @@ public void Deserialize_YamlWithInterfaceTypeAndMapping_ReturnsModel()

var person = sut.Deserialize<Person>(yaml);
person.Name.Should().Be("Jack");
person.MomentOfBirth.Kind.Should().Be(DateTimeKind.Utc);
person.MomentOfBirth.ToUniversalTime().Year.Should().Be(1983);
person.MomentOfBirth.ToUniversalTime().Month.Should().Be(4);
person.MomentOfBirth.ToUniversalTime().Day.Should().Be(21);
person.MomentOfBirth.ToUniversalTime().Hour.Should().Be(20);
person.MomentOfBirth.ToUniversalTime().Minute.Should().Be(21);
person.MomentOfBirth.ToUniversalTime().Second.Should().Be(3);
person.Cars.Should().HaveCount(2);
person.Cars[0].Name.Should().Be("Mercedes");
person.Cars[0].Spec.Should().BeNull();
Expand All @@ -60,6 +69,7 @@ public void Deserialize_YamlWithTwoInterfaceTypesAndMappings_ReturnsModel()
{
var yaml = @"
name: Jack
momentOfBirth: 1983-04-21T20:21:03.0041599Z
cars:
- name: Mercedes
year: 2018
Expand All @@ -81,6 +91,13 @@ public void Deserialize_YamlWithTwoInterfaceTypesAndMappings_ReturnsModel()

var person = sut.Deserialize<Person>(yaml);
person.Name.Should().Be("Jack");
person.MomentOfBirth.Kind.Should().Be(DateTimeKind.Utc);
person.MomentOfBirth.ToUniversalTime().Year.Should().Be(1983);
person.MomentOfBirth.ToUniversalTime().Month.Should().Be(4);
person.MomentOfBirth.ToUniversalTime().Day.Should().Be(21);
person.MomentOfBirth.ToUniversalTime().Hour.Should().Be(20);
person.MomentOfBirth.ToUniversalTime().Minute.Should().Be(21);
person.MomentOfBirth.ToUniversalTime().Second.Should().Be(3);
person.Cars.Should().HaveCount(2);
person.Cars[0].Name.Should().Be("Mercedes");
person.Cars[0].Spec.EngineType.Should().Be("V6");
Expand All @@ -94,6 +111,8 @@ public class Person
{
public string Name { get; private set; }

public DateTime MomentOfBirth { get; private set; }

public IList<ICar> Cars { get; private set; }
}

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5 changes: 4 additions & 1 deletion YamlDotNet/Serialization/NodeDeserializers/ScalarNodeDeserializer.cs
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Expand Up @@ -91,7 +91,10 @@ bool INodeDeserializer.Deserialize(IParser parser, Type expectedType, Func<IPars

case TypeCode.DateTime:
// TODO: This is probably incorrect. Use the correct regular expression.
value = DateTime.Parse(scalar.Value, CultureInfo.InvariantCulture);
var style = scalar.Value.EndsWith("Z")
? DateTimeStyles.RoundtripKind
: 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);

value = DateTime.Parse(scalar.Value, CultureInfo.InvariantCulture, style);
break;

default:
Expand Down