Working with DateOnly and TimeOnly (C#)

This repository demonstrates simple usage of DateOnly Struct done with a prerelease product.

There is a class project which is responsible for reading a json file with type Person class into a list using System.Text.Json. JsonSerializer.Deserialize. In the unit test project this data is tested as instances of the Person class.

Extension

To convert a DateOnly variable to a DateTime we use ToDateTime which requires a TimeOnly so to keep code light here is a lazy extension which default to mid-night or allows changing hours and/or minutes.

public static DateTime ToDateTime(this DateOnly sender, int hour = 0, int minutes = 0)
    => sender.ToDateTime(new TimeOnly(hour, minutes));

Remarks

• File scoped namespaces feature from C# 10 won't work
• To use DateOnly and TimeOnly install SDK 6x
• If using VS2019 for desktop projects
  • Set Use previews as shown in the image below
  • Set TargetFramework to net6.0-windows

<Project Sdk="Microsoft.NET.Sdk">

  <PropertyGroup>
	  <LangVersion>9.0</LangVersion>
	  <TargetFramework>net6.0-windows</TargetFramework>
  </PropertyGroup>

</Project>

• Currently no code samples for TimeOnly which will follow shortly.

See also

• Developers can benefit from enhanced Date and Time types and Timezone support
• NodaTime ZonedDateTime