From 10786e27052cced50a81ed7455d9f5974aa9dcc8 Mon Sep 17 00:00:00 2001
From: Jakub Bednar <jakub.bednar@gmail.com>
Date: Fri, 16 Dec 2022 09:53:28 +0100
Subject: [PATCH 1/4] feat: allow to use `DateTimeKind.Local` and
 `DateTimeKind.Local` as a timestamp for data point

---
 Client.Test/PointDataTest.cs | 30 ++++++++++++++++++++++++++----
 Client/Writes/PointData.cs   | 11 +++++++++--
 2 files changed, 35 insertions(+), 6 deletions(-)

diff --git a/Client.Test/PointDataTest.cs b/Client.Test/PointDataTest.cs
index 3cc8ca87e..7ada8fec8 100644
--- a/Client.Test/PointDataTest.cs
+++ b/Client.Test/PointDataTest.cs
@@ -290,15 +290,37 @@ public void DateTimeFormatting()
         }
 
         [Test]
-        public void DateTimeUtc()
+        public void DateTimeUnspecified()
         {
-            var dateTime = new DateTime(2015, 10, 15, 8, 20, 15);
+            var dateTime = new DateTime(2015, 10, 15, 8, 20, 15, DateTimeKind.Unspecified);
 
             var point = PointData.Measurement("h2o")
                 .Tag("location", "europe")
-                .Field("level", 2);
+                .Field("level", 2)
+                .Timestamp(dateTime, WritePrecision.Ms);
+
+            Assert.AreEqual("h2o,location=europe level=2i 1444897215000", point.ToLineProtocol());
+        }
+
+        [Test]
+        public void DateTimeLocal()
+        {
+            var dateTime = new DateTime(2015, 10, 15, 8, 20, 15, DateTimeKind.Local);
+
+            var point = PointData.Measurement("h2o")
+                .Tag("location", "europe")
+                .Field("level", 2)
+                .Timestamp(dateTime, WritePrecision.Ms);
+
+            var lineProtocolLocal = point.ToLineProtocol();
+
+            point = PointData.Measurement("h2o")
+                .Tag("location", "europe")
+                .Field("level", 2)
+                .Timestamp(TimeZoneInfo.ConvertTimeToUtc(dateTime), WritePrecision.Ms);
+            var lineProtocolUtc = point.ToLineProtocol();
 
-            Assert.Throws<ArgumentException>(() => point.Timestamp(dateTime, WritePrecision.Ms));
+            Assert.AreEqual(lineProtocolUtc, lineProtocolLocal);
         }
 
         [Test]
diff --git a/Client/Writes/PointData.cs b/Client/Writes/PointData.cs
index ebabc8597..862ce4524 100644
--- a/Client/Writes/PointData.cs
+++ b/Client/Writes/PointData.cs
@@ -252,12 +252,19 @@ public PointData Timestamp(TimeSpan timestamp, WritePrecision timeUnit)
         /// <returns></returns>
         public PointData Timestamp(DateTime timestamp, WritePrecision timeUnit)
         {
-            if (timestamp != null && timestamp.Kind != DateTimeKind.Utc)
+            var utcTimestamp = timestamp.Kind switch
+            {
+                DateTimeKind.Local => timestamp.ToUniversalTime(),
+                DateTimeKind.Unspecified => DateTime.SpecifyKind(timestamp, DateTimeKind.Utc),
+                var _ => timestamp
+            };
+
+            if (utcTimestamp.Kind != DateTimeKind.Utc)
             {
                 throw new ArgumentException("Timestamps must be specified as UTC", nameof(timestamp));
             }
 
-            var timeSpan = timestamp.Subtract(EpochStart);
+            var timeSpan = utcTimestamp.Subtract(EpochStart);
 
             return Timestamp(timeSpan, timeUnit);
         }

From c84b3447d7374598c4e13e1d16b3dcf5d566503e Mon Sep 17 00:00:00 2001
From: Jakub Bednar <jakub.bednar@gmail.com>
Date: Fri, 16 Dec 2022 10:15:33 +0100
Subject: [PATCH 2/4] docs: update CHANGELOG.md

---
 CHANGELOG.md                |  3 +++
 Client.Test/WriteApiTest.cs | 12 +++++++++---
 2 files changed, 12 insertions(+), 3 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 628530960..8ea10a1ea 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,8 @@
 ## 4.10.0 [unreleased]
 
+### Bug Fixes
+1. [#442](https://github.com/influxdata/influxdb-client-csharp/pull/442): Allow to use `DateTimeKind.Local` and `DateTimeKind.Local` as a timestamp for Data point
+
 ### Dependencies
 Update dependencies:
 
diff --git a/Client.Test/WriteApiTest.cs b/Client.Test/WriteApiTest.cs
index 71a44fb45..ee3174d8f 100644
--- a/Client.Test/WriteApiTest.cs
+++ b/Client.Test/WriteApiTest.cs
@@ -494,14 +494,14 @@ public void WriteRuntimeException()
             {
                 Time = new DateTime(2020, 11, 15, 8, 20, 15),
                 Device = "id-1",
-                Value = 15
+                Value = -1
             };
             _writeApi.WriteMeasurement(measurement, WritePrecision.S, "b1", "org1");
 
             var error = listener.Get<WriteRuntimeExceptionEvent>();
 
             Assert.IsNotNull(error);
-            StringAssert.StartsWith("Timestamps must be specified as UTC", error.Exception.Message);
+            StringAssert.StartsWith("Something is wrong", error.Exception.InnerException?.Message);
 
             Assert.AreEqual(0, MockServer.LogEntries.Count());
         }
@@ -604,10 +604,16 @@ public void WritesToDifferentBucketsJitter()
     [Measurement("m")]
     public class SimpleModel
     {
+        private int _value;
+        
         [Column(IsTimestamp = true)] public DateTime Time { get; set; }
 
         [Column("device", IsTag = true)] public string Device { get; set; }
 
-        [Column("value")] public int Value { get; set; }
+        [Column("value")] public int Value
+        {
+            get => _value == -1 ? throw new ArgumentException("Something is wrong"): _value;
+            set => _value = value;
+        }
     }
 }
\ No newline at end of file

From 154e450a5904b9b09cf78506ac447fa74d7a9d71 Mon Sep 17 00:00:00 2001
From: Jakub Bednar <jakub.bednar@gmail.com>
Date: Fri, 16 Dec 2022 10:32:03 +0100
Subject: [PATCH 3/4] fix: code style

---
 Client.Test/WriteApiTest.cs | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/Client.Test/WriteApiTest.cs b/Client.Test/WriteApiTest.cs
index ee3174d8f..ec2b3fc3a 100644
--- a/Client.Test/WriteApiTest.cs
+++ b/Client.Test/WriteApiTest.cs
@@ -605,14 +605,15 @@ public void WritesToDifferentBucketsJitter()
     public class SimpleModel
     {
         private int _value;
-        
+
         [Column(IsTimestamp = true)] public DateTime Time { get; set; }
 
         [Column("device", IsTag = true)] public string Device { get; set; }
 
-        [Column("value")] public int Value
+        [Column("value")]
+        public int Value
         {
-            get => _value == -1 ? throw new ArgumentException("Something is wrong"): _value;
+            get => _value == -1 ? throw new ArgumentException("Something is wrong") : _value;
             set => _value = value;
         }
     }

From 98ebdc3d72be6ec64278b793e131e79c4111e845 Mon Sep 17 00:00:00 2001
From: Jakub Bednar <jakub.bednar@gmail.com>
Date: Fri, 16 Dec 2022 13:44:41 +0100
Subject: [PATCH 4/4] feat: allow to use `DateTimeKind.Local` and
 `DateTimeKind.Local` as a timestamp for data point

---
 Client/Writes/PointData.cs | 5 -----
 1 file changed, 5 deletions(-)

diff --git a/Client/Writes/PointData.cs b/Client/Writes/PointData.cs
index 862ce4524..10f06d82d 100644
--- a/Client/Writes/PointData.cs
+++ b/Client/Writes/PointData.cs
@@ -259,11 +259,6 @@ public PointData Timestamp(DateTime timestamp, WritePrecision timeUnit)
                 var _ => timestamp
             };
 
-            if (utcTimestamp.Kind != DateTimeKind.Utc)
-            {
-                throw new ArgumentException("Timestamps must be specified as UTC", nameof(timestamp));
-            }
-
             var timeSpan = utcTimestamp.Subtract(EpochStart);
 
             return Timestamp(timeSpan, timeUnit);

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