How to Specify Custom Date Formats for DateTime Serialization in Json.Net without Global Settings?

Json.Net custom DateTime serialized date format

Question:

When using Json.Net serialization in ASP.NET Web API, how to specify a custom date format while avoiding modifying global settings to meet the needs of a specific application?

Answer:

The recommended approach is to use a custom JsonConverter for selective formatting. Json.Net provides an IsoDateTimeConverter that allows custom formatting. Since the format cannot be set directly through the JsonConverter property, you can create a subclass and specify the desired format in its constructor. A custom converter can then be applied to a specific property using the JsonConverter property:

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

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

If you do not need the time format, you can directly apply the default date format of IsoDateTimeConverter:

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

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