Remove any fraction from published time when checking recency

inbox.py

@@ -2505,6 +2505,8 @@ def _valid_post_content(base_dir: str, nickname: str, domain: str,
     if 'T' not in published:
         return False
     if 'Z' not in published:
+        print('REJECT inbox post does not use Zulu time format. ' +
+              published)
         return False
     if '.' in published:
         # converts 2022-03-30T17:37:58.734Z into 2022-03-30T17:37:58Z

utils.py

@@ -2753,6 +2753,8 @@ def is_recent_post(post_json_object: {}, max_days: int) -> bool:
     recently = days_since_epoch - max_days
 
     published_date_str = post_json_object['object']['published']
+    if '.' in published_date_str:
+        published_date_str = published_date_str.split('.')[0] + 'Z'
     try:
         published_date = \
             datetime.datetime.strptime(published_date_str,