From f2fa243f4170c882fe8e5d9e7f31786197d500b1 Mon Sep 17 00:00:00 2001
From: Shay Rojansky <roji@roji.org>
Date: Wed, 1 Jun 2022 08:38:06 +0200
Subject: [PATCH] General infinity literals for DateTimeOffset min/max values

Fixes #2389
---
 .../Mapping/NpgsqlTimestampTzTypeMapping.cs         | 13 +++++++++++++
 .../Storage/NpgsqlTypeMappingTest.cs                |  8 ++++++++
 2 files changed, 21 insertions(+)

diff --git a/src/EFCore.PG/Storage/Internal/Mapping/NpgsqlTimestampTzTypeMapping.cs b/src/EFCore.PG/Storage/Internal/Mapping/NpgsqlTimestampTzTypeMapping.cs
index ab48a1390..cf3ca7b50 100644
--- a/src/EFCore.PG/Storage/Internal/Mapping/NpgsqlTimestampTzTypeMapping.cs
+++ b/src/EFCore.PG/Storage/Internal/Mapping/NpgsqlTimestampTzTypeMapping.cs
@@ -58,6 +58,19 @@ private string GenerateLiteralCore(object value)
                 };
 
             case DateTimeOffset dateTimeOffset:
+                if (!NpgsqlTypeMappingSource.DisableDateTimeInfinityConversions)
+                {
+                    if (dateTimeOffset == DateTimeOffset.MinValue)
+                    {
+                        return "-infinity";
+                    }
+
+                    if (dateTimeOffset == DateTimeOffset.MaxValue)
+                    {
+                        return "infinity";
+                    }
+                }
+
                 return dateTimeOffset.ToString("yyyy-MM-dd HH:mm:ss.FFFFFFzzz", CultureInfo.InvariantCulture);
 
             default:
diff --git a/test/EFCore.PG.Tests/Storage/NpgsqlTypeMappingTest.cs b/test/EFCore.PG.Tests/Storage/NpgsqlTypeMappingTest.cs
index ad54a3722..43aa50cf8 100644
--- a/test/EFCore.PG.Tests/Storage/NpgsqlTypeMappingTest.cs
+++ b/test/EFCore.PG.Tests/Storage/NpgsqlTypeMappingTest.cs
@@ -125,6 +125,14 @@ public void GenerateSqlLiteral_returns_timestamptz_infinity_literals()
         Assert.Equal(
             "TIMESTAMPTZ 'infinity'",
             GetMapping("timestamptz").GenerateSqlLiteral(DateTime.MaxValue));
+
+        Assert.Equal(
+            "TIMESTAMPTZ '-infinity'",
+            GetMapping("timestamptz").GenerateSqlLiteral(DateTimeOffset.MinValue));
+
+        Assert.Equal(
+            "TIMESTAMPTZ 'infinity'",
+            GetMapping("timestamptz").GenerateSqlLiteral(DateTimeOffset.MaxValue));
     }
 
     [Fact]