Custom period

yfinance/scrapers/history.py

@@ -78,7 +78,7 @@ def history(self, period="1mo", interval="1d",
 
         interval_user = interval
         period_user = period
-        if repair and interval in ['5d', '1wk', '1mo', '3mo']:
+        if repair and interval in ["5d", "1wk", "1mo", "3mo"]:
             # Yahoo's way of adjusting mutiday intervals is fundamentally broken.
             # Have to fetch 1d, adjust, then resample.
             if interval == '5d':
@@ -105,6 +105,11 @@ def history(self, period="1mo", interval="1d",
                 period_user = period
                 period = None
             interval = '1d'
+        else:
+            end = utils._parse_user_dt(end, self.tz)
+            start = _datetime.date.fromordinal(end)
+            start -= utils._interval_to_timedelta(period)
+            start -= _datetime.timedelta(days=4)
 
         start_user = start
         end_user = end

yfinance/utils.py

@@ -429,22 +429,14 @@ def _parse_user_dt(dt, exchange_tz):
 
 
 def _interval_to_timedelta(interval):
-    if interval == "1mo":
-        return relativedelta(months=1)
-    elif interval == "3mo":
-        return relativedelta(months=3)
-    elif interval == "6mo":
-        return relativedelta(months=6)
-    elif interval == "1y":
-        return relativedelta(years=1)
-    elif interval == "2y":
-        return relativedelta(years=2)
-    elif interval == "5y":
-        return relativedelta(years=5)
-    elif interval == "10y":
-        return relativedelta(years=10)
-    elif interval == "1wk":
-        return _pd.Timedelta(days=7)
+    if interval[-1] == "d":
+        return relativedelta(days=int(interval[:-1]))
+    elif interval[-2:] == "wk": 
+        return relativedelta(weeks=int(interval[:-2]))
+    elif interval[-2:] == "mo":
+        return relativedelta(months=int(interval[:-2]))
+    elif interval[-1] == "y":
+        return relativedelta(years=int(interval[:-1]))
     else:
         return _pd.Timedelta(interval)