The service for demonstrating delayed instantiation using .NET dependency injection mechanism

CreatedOnDateTimeService.cs

// ICreatedOnDateTimeService.cs
public interface ICreatedOnDateTimeService
{
    public DateTime CreatedOn { get; set; }
}

// CreatedOnDateTimeService.cs
public class CreatedOnDateTimeService : ICreatedOnDateTimeService
{
    private readonly DateTime createdOn;

    public CreatedOnDateTimeService()
    {
        createdOn = DateTime.Now;
    }

    public DateTime CreatedOn { get => createdOn; set => throw new NotImplementedException(); }
}