Homw to convert datetimeoffset to datetime in C# in mapper.map

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Hi Team,
Could you please assist with the below requirement I am facing the issue while converting from DateTime to DateTimeOffset while using Mapper.Map
Getting error:

Unable to cast object of type 'System.DateTimeOffset' to type 'System.IConvertible

I have tried with the below code

class Program
    {
        static void Main(string[] args)
        {
            A a = new A();
            a.ADate = DateTime.Now.AddDays(2);
            B b = new B();
            b.BDate = DateTime.Now.AddDays(6);
            a.ADate = Convert.ToDateTime(b.BDate);
            Mapper.Map(a, b);
            Console.WriteLine("Hi" + b.BDate);
            Console.Read();
        }
    }
    class A
    {
        public DateTime ADate { get; set; }
    }
    class B
    {
        public DateTimeOffset BDate { get; set; }
    }

What I have tried:

class Program
    {
        static void Main(string[] args)
        {
            A a = new A();
            a.ADate = DateTime.Now.AddDays(2);
            B b = new B();
            b.BDate = DateTime.Now.AddDays(6);
            a.ADate = Convert.ToDateTime(b.BDate);
            Mapper.Map(a, b);
            Console.WriteLine("Hi" + b.BDate);
            Console.Read();
        }
    }
    class A
    {
        public DateTime ADate { get; set; }
    }
    class B
    {
        public DateTimeOffset BDate { get; set; }
    }

Posted 31-Jan-23 6:10am

Member 15090354

Updated 31-Jan-23 10:27am

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Graeme_Grant · Answer 1 · 2023-01-31T10:27:00

I do not use the Mapper[^] lib, but, for a better understanding of how they work, I will give you examples of doing it manually.

Below are examples of working with the DateTime[^] and DateTimeOffset[^], using TimeZoneInfo[^]:

C#

using System.Diagnostics;

const string dateString = "2012-11-20T00:00:00Z";

// this timezone has an offset of +01:00:00 on this date
TimeZoneInfo timezone = TimeZoneInfo
    .FindSystemTimeZoneById("W. Europe Standard Time");

DateTimeOffset utc = DateTimeOffset.Parse(dateString);
DateTimeOffset result = TimeZoneInfo.ConvertTime(utc, timezone);

// the correct utc offset, in this case +01:00:00
Debug.Assert(result.Offset == new TimeSpan(1, 0, 0));

//equals the original date
Debug.Assert(result.UtcDateTime == new DateTime(2012, 11, 20, 0, 0, 0));
Debug.Assert(result.DateTime == new DateTime(2012, 11, 20, 1, 0, 0));

Lastly, for Mapper, it appears that you need to use a Custom Type Converter[^]. The above example should help you in doing this.