datetime-parse

C# – Call a constructor from another constructor

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To call one constructor from another one, you have to use the constructor chaining syntax, like this: This means when you use the Person(string name) constructor, it’ll first call the Person(string name, string birthDate) constructor. If the constructor is in a base class, use base() instead of this(): Employee subclasses Person. So calling base(name) here … Read more

C# – Round up to the nearest 30 minutes

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Here’s how to round a DateTime up to the nearest 30 minutes: When the time is 3:38 pm, it rounds to 4:00 pm. When it’s 5:03 pm, it rounds to 5:30 pm. When it’s exactly 2:00 pm, it’ll round up to 2:30 pm (note: see the What if you’re at the start of a 30 … 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

C# – Create a custom JsonConverter for System.Text.Json

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Most of the time System.Text.Json will get you want you want. You can pass in options to control JSON serialization and deserialization to a certain extent. But sometimes you’ll run into scenarios where you need to customize how it handles a specific type. This is where JsonConverter comes in. You can customize serialization / deserialization … Read more

C# – How to test that your code can handle another culture’s date format

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Let’s say you have code that converts a string to a DateTime with DateTime.Parse(): By default, DateTime.Parse() uses CultureInfo.CurrentCulture to figure out the date format. The current culture ultimately comes from your OS settings. So when you run this code on a computer that is using the en-US locale, the current culture will automatically default … Read more