Merge pull request #471 from williamhobbs/main

update herbielatest to use periods

Author: blaylockbk

src/herbie/latest.py

@@ -29,6 +29,8 @@ def HerbieLatest(
         but I also know AWS gets the data pretty quick. So, check AWS
         first, then check NOMADS (because if you make too many downloads
         from NOMADS your IP address will get blocked.)
+    periods : int
+        The number of periods (initialization datetimes) to search through.
     **kwargs
         Any other input you want passed to the Herbie class.
     """
@@ -40,7 +42,7 @@ def HerbieLatest(
     # Create a list of recent dates to try
     dates = pd.date_range(
         pd.Timestamp.utcnow().floor(freq).tz_localize(None),
-        periods=4,
+        periods=periods,
         freq=f"-{freq}",
     )