fix playlist last update

+ create a recently added playlist on get api

app/utils/dates.py

@@ -4,25 +4,24 @@ from datetime import datetime
 _format = "%Y-%m-%d %H:%M:%S"
 
 
-def create_new_date():
+def create_new_date(date: datetime = None) -> str:
     """
     Creates a new date and time string in the format of "YYYY-MM-DD HH:MM:SS"
     :return: A string of the current date and time.
     """
-    now = datetime.now()
-    return now.strftime(_format)
+    if not date:
+        date = datetime.now()
+
+    return date.strftime(_format)
 
 
 def date_string_to_time_passed(prev_date: str) -> str:
     """
     Converts a date string to time passed. e.g. 2 minutes ago, 1 hour ago, yesterday, 2 days ago, 2 weeks ago, etc.
     """
-    now = datetime.now()
-    then = datetime.strptime(prev_date, _format)
+    now = datetime.now().timestamp()
+    then = datetime.strptime(prev_date, _format).timestamp()
 
     diff = now - then
-    seconds = diff.seconds
-
     now = pendulum.now()
-    return now.subtract(seconds=seconds).diff_for_humans()
-
+    return now.subtract(seconds=diff).diff_for_humans()