Make LiveLocationAttachment.expires_at a datetime object

Renamed from .expiration_time

fbchat/_location.py

@@ -59,14 +59,14 @@ class LiveLocationAttachment(LocationAttachment):
 
     #: Name of the location
     name = attr.ib(None)
-    #: Timestamp when live location expires
-    expiration_time = attr.ib(None)
+    #: Datetime when live location expires
+    expires_at = attr.ib(None)
     #: True if live location is expired
     is_expired = attr.ib(None)
 
-    def __init__(self, name=None, expiration_time=None, is_expired=None, **kwargs):
+    def __init__(self, name=None, expires_at=None, is_expired=None, **kwargs):
         super(LiveLocationAttachment, self).__init__(**kwargs)
-        self.expiration_time = expiration_time
+        self.expires_at = expires_at
         self.is_expired = is_expired
 
     @classmethod
@@ -80,7 +80,7 @@ class LiveLocationAttachment(LocationAttachment):
             if not data.get("stopReason")
             else None,
             name=data.get("locationTitle"),
-            expiration_time=data["expirationTime"],
+            expires_at=_util.millis_to_datetime(data["expirationTime"]),
             is_expired=bool(data.get("stopReason")),
         )
 
@@ -96,7 +96,7 @@ class LiveLocationAttachment(LocationAttachment):
             if target.get("coordinate")
             else None,
             name=data["title_with_entities"]["text"],
-            expiration_time=target.get("expiration_time"),
+            expires_at=_util.millis_to_datetime(target.get("expiration_time")),
             is_expired=target.get("is_expired"),
         )
         media = data.get("media")