diff --git a/pomodoro_to_harvest.py b/pomodoro_to_harvest.py
index 3d4af24..6d7f8e0 100644
--- a/pomodoro_to_harvest.py
+++ b/pomodoro_to_harvest.py
@@ -228,7 +228,7 @@ tl = timelog.groupby(["date", timelog.project.fillna(""), timelog.subproject.fil
 # want to factor out all of the above non-Harvest-specific logic.
 
 latest = tl.recorded.max()
-datest = str(tl.date.max())
+datest = tl.date.max().strftime('%Y-%m-%d')
 
 # Separate Harvest from non-Harvest projects, and also filter out any blank
 # projects, but save those too for a CSV of the excluded items.