[jira] [Created] (ARROW-8581) [C#] Date32/64Array write & read back introduces off-by-one error

["Adam Szmigin (Jira)" <ji...@apache.org>]

Adam Szmigin created ARROW-8581:
-----------------------------------

             Summary: [C#] Date32/64Array write & read back introduces off-by-one error
                 Key: ARROW-8581
                 URL: https://issues.apache.org/jira/browse/ARROW-8581
             Project: Apache Arrow
          Issue Type: Bug
          Components: C#
    Affects Versions: 0.17.0
         Environment: Windows 10 x64
            Reporter: Adam Szmigin


h1. Summary

Writing a Date value using either a {{Date32Array.Builder}} or {{Date64.Builder}} and then reading back the result from the built array introduces an off-by-one error in the value.  The following minimal code illustrates:
{code:c#}
namespace Date32ArrayReadWriteBug
{
    using Apache.Arrow;
    using Apache.Arrow.Memory;
    using System;    internal static class Program
    {
        public static void Main(string[] args)
        {
            var allocator = new NativeMemoryAllocator();
            var builder = new Date32Array.Builder();
            var date = new DateTime(2020, 4, 24);
            Console.WriteLine($"Appending date {date:yyyy-MM-dd}");
            builder.Append(date);
            var array = builder.Build(allocator);
            var dateAgain = array.GetDate(0);
            Console.WriteLine($"Read date {dateAgain:yyyy-MM-dd}");
        }
    }
}{code}
h2. Expected Output
{noformat}
Appending date 2020-04-24
Read date 2020-04-24 {noformat}
h2. Actual Output
{noformat}
Appending date 2020-04-24
Read date 2020-04-23 {noformat}
 



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