change substack time parsing to misc.time

apiserver/feeds/substack.py

@@ -10,6 +10,7 @@ if __name__ == '__main__':
 import requests
 from datetime import datetime
 
+from misc.time import unix
 from utils import clean
 
 SUBSTACK_REFERER = 'https://substack.com'
@@ -22,9 +23,6 @@ def api_comments(post_id, base_url):
 def api_stories(x, base_url): 
     return f"{base_url}/api/v1/archive?sort=new&search=&offset=0&limit=100"
 
-def unix(date_str):
-    return int(datetime.strptime(date_str, '%Y-%m-%dT%H:%M:%S.%fZ').timestamp())
-
 def api(route, ref=None, referer=None):
     headers = {'Referer': referer} if referer else None
     try: