How to Customize Date Serialization Format in Json.Net without Affecting Global Settings?

Json.Net date serialization format customization

In some API development scenarios, you may need to customize the date serialization format of specific data without affecting global settings. One efficient way is to use a custom JsonConverter.

As you suggested, this can be achieved by creating a custom class that inherits from the JsonConverter base class. Here's an example:

<code class="language-csharp">public class CustomDateTimeConverter : JsonConverter
{
    public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
    {
        var date = (DateTime)value;
        writer.WriteValue(date.ToString("yyyy'-'MM'-'dd"));
    }

    public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
    {
        throw new NotImplementedException(); // 此示例中未实现
    }

    public override bool CanConvert(Type objectType)
    {
        return objectType == typeof(DateTime);
    }
}</code>

This custom converter can then be applied to properties that require a specified date format:

<code class="language-csharp">public class ReturnObjectA
{
    [JsonConverter(typeof(CustomDateTimeConverter))]
    public DateTime ReturnDate { get; set; }
}</code>

However, Json.Net also provides a simpler solution, which is to use the built-in IsoDateTimeConverter. This converter allows you to specify the date format in its constructor:

<code class="language-csharp">public class CustomDateTimeConverter : IsoDateTimeConverter
{
    public CustomDateTimeConverter()
    {
        DateTimeFormat = "yyyy'-'MM'-'dd";
    }
}</code>

You can customize date serialization without modifying global settings by subclassing IsoDateTimeConverter and applying custom converter properties with your desired format.

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