datetime-parseexact

C# – How to use JsonConverterAttribute

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You can use JsonConverterAttribute (from System.Text.Json) to apply a specific JsonConverter to a property. Apply this attribute on a property and specify the JsonConverter type to use, like this: In this example, it’s applying ExpirationDateConverter (a custom JSON converter) to handle the ExpirationDate. For reference, here’s ExpirationDateConverter’s definition: Now serialize the object to JSON: Here’s … Read more

C# – Changing the JSON serialization date format

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When you serialize a date with System.Text.Json, it uses the standard ISO-8601 date format (ex: “2022-01-31T13:15:05.2151663-05:00”). Internally, it uses the built-in DateTimeConverter class for handling DateTime, which doesn’t give you a way to change the date format. To change the date format, you have to create a custom JSON converter and pass it in: This … Read more

The JSON value could not be converted to System.DateTime

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When you’re using System.Text.Json to deserialize a DateTime value, if the value isn’t in the format it expects, then it’ll throw a JsonException. It expects datetimes to be in the ISO-8601-1:2019 format (for example: 2021-07-12T12:35:34+00:00). For example, the following code is trying to deserialize a DateTime value in an unexpected format: This’ll throw the following … Read more

C# – Parsing a DateTime from a string

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You can convert a string to a DateTime (parse) with one of these methods: I’ll show examples of using both methods for parsing various DateTime formats. Using DateTime.Parse() DateTime.Parse() can handle parsing a wide variety of culture-specific standard DateTime formats and the ISO-8601 format (which is the default date format for JSON serialization). By default, … Read more