Use the difference between the unix_zero and start to prevent the bug occurrence of OverflowError: mktime argument out of range.

Author: ice-tong

pandas_datareader/yahoo/daily.py

@@ -127,11 +127,9 @@ def url(self):
     def _get_params(self, symbol):
         # This needed because yahoo returns data shifted by 4 hours ago.
         four_hours_in_seconds = 14400
+        # Use the difference between the unix_zero and start to prevent the bug occurrence of `OverflowError: mktime argument out of range`.
         unix_zero = datetime.datetime(1970, 1, 1, 8)
-        if self.start < unix_zero:
-            unix_start = int((self.start - unix_zero).total_seconds())
-        else:
-            unix_start = int(time.mktime(self.start.timetuple()))
+        unix_start = int((self.start - unix_zero).total_seconds())
         unix_start += four_hours_in_seconds
         day_end = self.end.replace(hour=23, minute=59, second=59)
         unix_end = int(time.mktime(day_end.timetuple()))