converted createdDate and updatedDate to unix timestamp

Author: Giuliano Dore

src/Umbraco.Cms.Integrations.Search.Algolia/Builders/ContentRecordBuilder.cs

@@ -2,6 +2,7 @@
 using Umbraco.Cms.Core.Routing;
 using Umbraco.Cms.Core.Services;
 using Umbraco.Cms.Core.Web;
+using Umbraco.Cms.Integrations.Search.Algolia.Extensions;
 using Umbraco.Cms.Integrations.Search.Algolia.Models;
 using Umbraco.Cms.Integrations.Search.Algolia.Services;
 using Umbraco.Extensions;
@@ -50,9 +51,9 @@ public ContentRecordBuilder BuildFromContent(IContent content, Func<IProperty, b
             _record.Id = content.Id;
             _record.Name = content.Name;
 
-            _record.CreateDate = content.CreateDate.ToString();
+            _record.CreateDate = content.CreateDate.ToUnixTimestamp();
             _record.CreatorName = creator.Name;
-            _record.UpdateDate = content.UpdateDate.ToString();
+            _record.UpdateDate = content.UpdateDate.ToUnixTimestamp();
             _record.WriterName = writer.Name;
 
             _record.TemplateId = content.TemplateId.HasValue ? content.TemplateId.Value : -1;

src/Umbraco.Cms.Integrations.Search.Algolia/Extensions/DateTimeExtensions.cs

@@ -0,0 +1,14 @@
+namespace Umbraco.Cms.Integrations.Search.Algolia.Extensions
+{
+    public static class DateTimeExtensions
+    {
+        public static long ToUnixTimestamp(this DateTime dateTime)
+        {
+            DateTime unixEpoch = new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc);
+            
+            TimeSpan elapsedTime = dateTime - unixEpoch;
+            
+            return (long)elapsedTime.TotalSeconds;
+        }
+    }
+}

src/Umbraco.Cms.Integrations.Search.Algolia/Models/Record.cs

@@ -30,11 +30,11 @@ public Record(Record record)
 
         public string Name { get; set; }
 
-        public string CreateDate { get; set; }
+        public long CreateDate { get; set; }
 
         public string CreatorName { get; set; }
 
-        public string UpdateDate { get; set; }
+        public long UpdateDate { get; set; }
 
         public string WriterName { get; set; }