#399

backend/app/services/post_import_previewer.rb

@@ -250,8 +250,7 @@ class PostImportPreviewer
   def sanitise_metadata_time value
     return nil unless value.is_a?(String)
 
-    time = Time.iso8601(value)
-    time.nsec.zero? ? time.iso8601 : time.iso8601(9)
+    Time.iso8601(value).in_time_zone.change(sec: 0, nsec: 0).iso8601
   rescue ArgumentError, TypeError
     nil
   end