diff --git a/Medium/Authentication/Token.cs b/Medium/Authentication/Token.cs
index a2744b4..d3201be 100644
--- a/Medium/Authentication/Token.cs
+++ b/Medium/Authentication/Token.cs
@@ -18,7 +18,7 @@ public class Token
         public Scope[] Scope { get; set; }
 
         [JsonProperty(PropertyName = "expires_at")]
-        [JsonConverter(typeof(UnixTimestampConverter))]
+        [JsonConverter(typeof(JsonNetConverters.UnixTime.UnixTimeConverter))]
         public DateTime ExpiresAt { get; set; }
     }
 }
\ No newline at end of file
diff --git a/Medium/Helpers/Helper.cs b/Medium/Helpers/Helper.cs
index 0246af9..5670f01 100644
--- a/Medium/Helpers/Helper.cs
+++ b/Medium/Helpers/Helper.cs
@@ -165,13 +165,6 @@ public static string GenerateWwwFormUrlEncodedString(Dictionary<string, string>
                 ConcatenateString("&");
         }
 
-        // Core.TimeUtilities.cs
-        public static DateTime? FromUnixTimestampMs(long? timestamp)
-        {
-            if (!timestamp.HasValue) return null;
-            return new DateTime(1970, 1, 1).AddMilliseconds(timestamp.Value);
-        }
-
         // Core.StringExtensions.cs
         public static string Replace(this string source, Regex regex, string replacement)
         {
diff --git a/Medium/Helpers/UnixTimestampConverter.cs b/Medium/Helpers/UnixTimestampConverter.cs
deleted file mode 100644
index 8a82ca0..0000000
--- a/Medium/Helpers/UnixTimestampConverter.cs
+++ /dev/null
@@ -1,28 +0,0 @@
-using System;
-using Newtonsoft.Json;
-using Newtonsoft.Json.Converters;
-using Newtonsoft.Json.Linq;
-
-namespace Medium.Helpers
-{
-    internal class UnixTimestampConverter : JsonConverter
-    {
-        private static readonly DateTime _epoch = new DateTime(1970, 1, 1);
-
-        public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
-        {
-            writer.WriteRawValue(((DateTime)value - _epoch).TotalMilliseconds.ToString());
-        }
-
-        public override bool CanConvert(Type objectType)
-        {
-            return objectType == new DateTime().GetType();
-        }
-
-        public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
-        {
-            var timestamp = reader.Value as long?;
-            return !timestamp.HasValue ? null : Helper.FromUnixTimestampMs(timestamp);
-        }
-    }
-}
\ No newline at end of file
diff --git a/Medium/Medium.csproj b/Medium/Medium.csproj
index 7962503..304b73e 100644
--- a/Medium/Medium.csproj
+++ b/Medium/Medium.csproj
@@ -21,6 +21,7 @@
   </ItemGroup>
 
   <ItemGroup>
+    <PackageReference Include="UnixTimeConverter" Version="1.3.0" />
     <PackageReference Include="Microsoft.CSharp" Version="4.3.0" />
     <PackageReference Include="System.Collections" Version="4.3.0" />
     <PackageReference Include="System.Linq" Version="4.3.0" />
diff --git a/Medium/Models/Post.cs b/Medium/Models/Post.cs
index d8adf2b..1536010 100644
--- a/Medium/Models/Post.cs
+++ b/Medium/Models/Post.cs
@@ -14,7 +14,7 @@ public class Post
         public string Url { get; set; }
         public string CanonicalUrl { get; set; }
         public PublishStatus PublishStatus { get; set; }
-        [JsonConverter(typeof(UnixTimestampConverter))]
+        [JsonConverter(typeof(JsonNetConverters.UnixTime.UnixTimeConverter))]
         public DateTime? PublishedAt { get; set; }
         [JsonConverter(typeof(LicenseEnumConverter))]
         public License License { get; set; }