Anthony Abate created ARROW-7508: ------------------------------------ Summary: DateTime Reading is Broken Key: ARROW-7508 URL: https://issues.apache.org/jira/browse/ARROW-7508 Project: Apache Arrow Issue Type: Bug Components: C# Affects Versions: 0.15.1 Reporter: Anthony Abate Assignee: Anthony Abate
DateTime support for writing works - but reading is broken. This another arithmetic overflow bug (reported a few already) which is causing date to be misinterpreted I extracted the current logic out to linqpad and to show the bug and fix: {code:java} var dto = DateTimeOffset.Parse("2024-09-25"); (dto.ToUnixTimeMilliseconds() / 86400000).Dump(); // YIELDS: 19991 unchecked (current code) { DateTimeOffset.FromUnixTimeMilliseconds(19991 * 86400000).Dump(); // 1/8/1970 WRONG } checked { DateTimeOffset.FromUnixTimeMilliseconds((long)19991 * 86400000).Dump(); // 9/25/2024 CORRECT } {code} this fix is trivial - a cast to long is missing whereever FromUnixTimeMilliseconds is used -- This message was sent by Atlassian Jira (v8.3.4#803005)