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} -- This message was sent by Atlassian Jira (v8.3.4#803005)