diff --git a/artifactory.py b/artifactory.py
index 8176a52..ad236bf 100755
--- a/artifactory.py
+++ b/artifactory.py
@@ -707,6 +707,7 @@ def rest_post(
         verify=True,
         cert=None,
         timeout=None,
+        json_data=None,
     ):
         """
         Perform a POST request to url with requests.session
@@ -714,6 +715,7 @@ def rest_post(
         url = quote_url(url)
         response = session.post(
             url,
+            json=json_data,
             params=params,
             headers=headers,
             verify=verify,
@@ -2640,13 +2642,15 @@ def promote_build(
         :param fail_fast: fail and abort the operation upon receiving an error. Default: true
         :return:
         """
-        url = f"/api/build/promote/{build_name}/{build_number}"
+        url = f"{self.drive}/api/build/promote/{build_name}/{build_number}"
 
         if not isinstance(properties, dict):
             raise ArtifactoryException("properties must be a dict")
 
-        iso_time = datetime.datetime.now().astimezone().isoformat()
-        params = {
+        iso_time = (
+            datetime.datetime.now().astimezone().strftime("%Y-%m-%dT%H:%M:%S.%f%z")
+        )
+        json_data = {
             "status": status,
             "comment": comment,
             "ciUser": ci_user,
@@ -2659,10 +2663,10 @@ def promote_build(
             "failFast": fail_fast,
         }
         if source_repo:
-            params["sourceRepo"] = source_repo
+            json_data["sourceRepo"] = source_repo
 
         if target_repo:
-            params["targetRepo"] = target_repo
+            json_data["targetRepo"] = target_repo
 
         if dependencies:
             if not scopes:
@@ -2673,11 +2677,11 @@ def promote_build(
             if not isinstance(scopes, list):
                 raise ArtifactoryException("scopes must be a list")
 
-            params["scopes"] = scopes
+            json_data["scopes"] = scopes
 
-        self.rest_post(
+        self._accessor.rest_post(
             url,
-            params=params,
+            json_data=json_data,
             session=self.session,
             verify=self.verify,
             cert=self.cert,