diff --git a/.gitignore b/.gitignore
index c8a84ca4..0bb62b58 100644
--- a/.gitignore
+++ b/.gitignore
@@ -203,3 +203,5 @@ fabric.properties
 
 # Our own folders
 artifacts/
+.vs/YouTrackSharp/v15/sqlite3/storage.ide
+.idea/.idea.YouTrackSharp/.idea/inspectionProfiles/profiles_settings.xml
diff --git a/src/YouTrackSharp/Json/UnixDateTimeOffsetConverter.cs b/src/YouTrackSharp/Json/UnixDateTimeOffsetConverter.cs
index d623dc04..2c0360d0 100644
--- a/src/YouTrackSharp/Json/UnixDateTimeOffsetConverter.cs
+++ b/src/YouTrackSharp/Json/UnixDateTimeOffsetConverter.cs
@@ -5,7 +5,7 @@
 namespace YouTrackSharp.Json
 {
     /// <summary>
-    /// A JSON convertor that can convert a unix timestamp into a <see cref="DateTimeOffset" /> value and vice-versa.
+    /// A JSON convertor that can convert a unix timestamp (in milliseconds) into a <see cref="DateTimeOffset" /> value and vice-versa.
     /// </summary>
     public class UnixDateTimeOffsetConverter
         : DateTimeConverterBase
@@ -15,11 +15,11 @@ public override void WriteJson(JsonWriter writer, object value, JsonSerializer s
         {
             if (value is DateTimeOffset)
             {
-                writer.WriteValue(((DateTimeOffset)value).ToUnixTimeSeconds());
+                writer.WriteValue(((DateTimeOffset)value).ToUnixTimeMilliseconds());
             }
             else if (value is DateTime)
             {
-                writer.WriteValue(new DateTimeOffset((DateTime)value).ToUnixTimeSeconds());
+                writer.WriteValue(new DateTimeOffset((DateTime)value).ToUnixTimeMilliseconds());
             }
             else
             {
diff --git a/tests/YouTrackSharp.Tests/Json/UnixDateTimeOffsetConverterTests.cs b/tests/YouTrackSharp.Tests/Json/UnixDateTimeOffsetConverterTests.cs
index e6d566e6..a784787f 100644
--- a/tests/YouTrackSharp.Tests/Json/UnixDateTimeOffsetConverterTests.cs
+++ b/tests/YouTrackSharp.Tests/Json/UnixDateTimeOffsetConverterTests.cs
@@ -34,8 +34,8 @@ public class WriteJson
         {
             public static IEnumerable<object[]> GetData()
             {
-                yield return new object[] { new DateTimeOffset(2001, 01, 01, 10, 11, 0, TimeSpan.Zero), new DateTimeOffset(2001, 01, 01, 10, 11, 0, TimeSpan.Zero).ToUnixTimeSeconds() };
-                yield return new object[] { new DateTimeOffset(2001, 01, 01, 10, 11, 0, TimeSpan.Zero).DateTime, new DateTimeOffset(new DateTimeOffset(2001, 01, 01, 10, 11, 0, TimeSpan.Zero).DateTime).ToUnixTimeSeconds() };
+                yield return new object[] { new DateTimeOffset(2001, 01, 01, 10, 11, 0, TimeSpan.Zero), new DateTimeOffset(2001, 01, 01, 10, 11, 0, TimeSpan.Zero).ToUnixTimeMilliseconds() };
+                yield return new object[] { new DateTimeOffset(2001, 01, 01, 10, 11, 0, TimeSpan.Zero).DateTime, new DateTimeOffset(new DateTimeOffset(2001, 01, 01, 10, 11, 0, TimeSpan.Zero).DateTime).ToUnixTimeMilliseconds() };
             }
 
             [Theory]