From ba913012ce76de8a51eda5eea55fa7aa5d798155 Mon Sep 17 00:00:00 2001
From: Christopher Jolly <chris-jolly_au@hotmail.com>
Date: Sun, 8 Oct 2023 01:19:39 +0800
Subject: [PATCH] The default value for DateTime in Jet is 30/12/1899 . When we
 save if we get a 1/1/001 we translate to this value. When reading we need to
 do the reverse translation

---
 src/EFCore.Jet.Data/JetDataReader.cs | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/EFCore.Jet.Data/JetDataReader.cs b/src/EFCore.Jet.Data/JetDataReader.cs
index cf03677..8a1e43f 100644
--- a/src/EFCore.Jet.Data/JetDataReader.cs
+++ b/src/EFCore.Jet.Data/JetDataReader.cs
@@ -167,6 +167,14 @@ namespace EntityFrameworkCore.Jet.Data
                                 MidpointRounding.AwayFromZero) *
                             TimeSpan.TicksPerMillisecond));
             }
+            //The 0/default value for a DateTime is 30/12/1899 00:00:00
+            //We normally translate 1/01/0001 00:00:00 to 30/12/1899 00:00:00 when saving to the database so this is just the reverse
+            if (value is DateTime dateTimeValue && dateTimeValue == JetConfiguration.TimeSpanOffset)
+            {
+                return default;
+            }
+            return (DateTime)value;
+        }
 
             return (DateTime)value;
         }