[API Proposal]: DateOnly support in IsoWeek

[leonluc-dev]

Background and motivation

At the moment the IsoWeek class only supports DateTime structs.

Since the IsoWeek class is primarily (if not exclusively) based around dates rather than times, it would make sense to have it support the recently added DateOnly struct.

API Proposal

Adding DateOnly variants of the public methods on the IsoWeek class.

namespace System.Globalization
{
    public static class ISOWeek
    {
        //Added methods
        public static int GetWeekOfYear(DateOnly date);
        public static int GetYear(DateOnly date);
        public static DateOnly ToDateOnly(int year, int week, DayOfWeek dayOfWeek);
    }
}

API Usage

var week = IsoWeek.GetWeekOfYear(new DateOnly(2024, 4, 26));

Alternative Designs

No response

Risks

No response

[dotnet-policy-service]

Tagging subscribers to this area: @dotnet/area-system-globalization
See info in area-owners.md if you want to be subscribed.