Fix 'ValueError: year is out of range' when year is set to 0000. Just set the time to the earliest valid time (in 1970)

pyicloud/services/photos.py

@@ -452,9 +452,12 @@ class PhotoAsset(object):
 
     @property
     def asset_date(self):
+        try:
             dt = datetime.fromtimestamp(
                 self._asset_record['fields']['assetDate']['value'] / 1000.0,
                 tz=pytz.utc)
+        except:
+            dt = datetime.fromtimestamp(0)
         return dt
 
     @property