SetDateTimeValue now uses DateTimeOffset

src/ImageSharp/Metadata/Profiles/IPTC/IptcProfile.cs

@@ -199,8 +199,8 @@ namespace SixLabors.ImageSharp.Metadata.Profiles.Iptc
         /// A time value will be formatted as HHMMSS±HHMM.
         /// </summary>
         /// <param name="tag">The tag of the iptc value.</param>
-        /// <param name="dateTime">The datetime.</param>
+        /// <param name="dateTimeOffset">The datetime.</param>
-        public void SetDateTimeValue(IptcTag tag, DateTime dateTime)
+        public void SetDateTimeValue(IptcTag tag, DateTimeOffset dateTimeOffset)
         {
             if (!tag.IsDate() && !tag.IsTime())
             {
@@ -208,8 +208,9 @@ namespace SixLabors.ImageSharp.Metadata.Profiles.Iptc
             }
 
             var formattedDate = tag.IsDate()
-                ? dateTime.ToString("yyyyMMdd", System.Globalization.CultureInfo.InvariantCulture)
+                ? dateTimeOffset.ToString("yyyyMMdd", System.Globalization.CultureInfo.InvariantCulture)
-                : dateTime.ToString("HHmmsszzzz", System.Globalization.CultureInfo.InvariantCulture).Replace(":", string.Empty);
+                : dateTimeOffset.ToString("HHmmsszzzz", System.Globalization.CultureInfo.InvariantCulture)
+                    .Replace(":", string.Empty);
 
             this.SetValue(tag, Encoding.UTF8, formattedDate);
         }

tests/ImageSharp.Tests/Metadata/Profiles/IPTC/IptcProfileTests.cs

@@ -51,7 +51,7 @@ namespace SixLabors.ImageSharp.Tests.Metadata.Profiles.IPTC
         {
             // arrange
             var profile = new IptcProfile();
-            var datetime = new DateTime(1994, 3, 17);
+            var datetime = new DateTimeOffset(new DateTime(1994, 3, 17));
 
             // act
             profile.SetDateTimeValue(tag, datetime);
@@ -70,14 +70,15 @@ namespace SixLabors.ImageSharp.Tests.Metadata.Profiles.IPTC
         {
             // arrange
             var profile = new IptcProfile();
-            DateTime datetime = new DateTimeOffset(new DateTime(1994, 3, 17, 14, 15, 16), new TimeSpan(1, 0, 0)).DateTime;
+            var dateTimeUtc = new DateTime(1994, 3, 17, 14, 15, 16, DateTimeKind.Utc);
+            DateTimeOffset dateTimeOffset = new DateTimeOffset(dateTimeUtc).ToOffset(TimeSpan.FromHours(2));
 
             // act
-            profile.SetDateTimeValue(tag, datetime);
+            profile.SetDateTimeValue(tag, dateTimeOffset);
 
             // assert
             IptcValue actual = profile.GetValues(tag).First();
-            Assert.Equal("141516+0100", actual.Value);
+            Assert.Equal("161516+0200", actual.Value);
         }
 
         [Theory]