diff --git a/src/microcosm/__init__.py b/src/microcosm/__init__.py
index e710181..1ca83d9 100644
--- a/src/microcosm/__init__.py
+++ b/src/microcosm/__init__.py
@@ -81,10 +81,10 @@ _api_client = None
 
 
 
-def process_photo_url(now: datetime, doc: Dict[str, List[str]], suffix: str = ""):
+def process_photo_url(created_at: datetime, doc: Dict[str, List[str]], suffix: str = ""):
     """Process photo submitted via URL"""
 
-    now_ts = int(time.mktime(now.timetuple()))
+    now_ts = int(time.mktime(created_at.timetuple()))
     
     photo_urls = []
 
@@ -103,9 +103,9 @@ def process_photo_url(now: datetime, doc: Dict[str, List[str]], suffix: str = ""
 
             # generate local filename
             filename = os.path.join(os.environ.get(
-                'MICROPUB_MEDIA_PATH'), now.strftime("%Y/%m/%d"), str(now_ts) + f"{now_ts}_{suffix}_{i}_{ext}")
+                'MICROPUB_MEDIA_PATH'), created_at.strftime("%Y/%m/%d"), str(now_ts) + f"{now_ts}_{suffix}_{i}_{ext}")
             photo_url = os.path.join(os.environ.get(
-                'MICROPUB_MEDIA_URL_PREFIX'), now.strftime("%Y/%m/%d"), str(now_ts) + f"{now_ts}_{suffix}_{i}_{ext}")
+                'MICROPUB_MEDIA_URL_PREFIX'), created_at.strftime("%Y/%m/%d"), str(now_ts) + f"{now_ts}_{suffix}_{i}_{ext}")
 
             photo_urls.append(photo_url)
 
@@ -123,10 +123,10 @@ def process_photo_url(now: datetime, doc: Dict[str, List[str]], suffix: str = ""
 
     return photo_urls
 
-def process_photo_upload(now: datetime, file: FileStorage, suffix: str=""):
+def process_photo_upload(created_at: datetime, file: FileStorage, suffix: str=""):
     """Process photo directly uploaded to micropub"""
 
-    now_ts = int(time.mktime(now.timetuple()))
+    now_ts = int(time.mktime(created_at.timetuple()))
 
     if os.environ.get('MICROPUB_IMAGE_STRATEGY') == 'copy':
 
@@ -134,9 +134,9 @@ def process_photo_upload(now: datetime, file: FileStorage, suffix: str=""):
 
         # generate local filename
         filename = os.path.join(os.environ.get(
-            'MICROPUB_MEDIA_PATH'), now.strftime("%Y/%m/%d"), f"{now_ts}_{suffix}{ext}")
+            'MICROPUB_MEDIA_PATH'), created_at.strftime("%Y/%m/%d"), f"{now_ts}_{suffix}{ext}")
         photo_url = os.path.join(os.environ.get(
-            'MICROPUB_MEDIA_URL_PREFIX'), now.strftime("%Y/%m/%d"),  f"{now_ts}_{suffix}{ext}")
+            'MICROPUB_MEDIA_URL_PREFIX'), created_at.strftime("%Y/%m/%d"),  f"{now_ts}_{suffix}{ext}")
 
         # make directory if needed
         if not os.path.exists(os.path.dirname(filename)):
@@ -150,9 +150,9 @@ def process_photo_upload(now: datetime, file: FileStorage, suffix: str=""):
         return None
 
 
-def init_frontmatter(now: datetime, post_type: str, name: Optional[str]=None):
+def init_frontmatter(created_at: datetime, post_type: str, name: Optional[str]=None):
 
-    now_ts = int(time.mktime(now.timetuple()))
+    now_ts = int(time.mktime(created_at.timetuple()))
 
     if name:
         if isinstance(name, list):
@@ -164,18 +164,18 @@ def init_frontmatter(now: datetime, post_type: str, name: Optional[str]=None):
 
 
     url = os.path.join("/", ENTITY_TYPE_PLURAL_MAP.get(post_type, post_type + "s"),
-                       now.strftime("%Y/%m/%d"), slug)
+                       created_at.strftime("%Y/%m/%d"), slug)
 
     print(os.environ.get(
         'CONTENT_PREFIX'))
 
     file_path = os.path.join(os.environ.get(
-        'CONTENT_PREFIX'), ENTITY_TYPE_PLURAL_MAP.get(post_type, post_type + "s"),  now.strftime("%Y/%m/%d"), slug + ".md")
+        'CONTENT_PREFIX'), ENTITY_TYPE_PLURAL_MAP.get(post_type, post_type + "s"),  created_at.strftime("%Y/%m/%d"), slug + ".md")
 
     frontmatter = {
         "url": url,
         "type": post_type,
-        "date": now.isoformat(sep='T'),
+        "date": created_at.isoformat(sep='T'),
     }
 
     return frontmatter, file_path