diff --git a/pomodoro_to_harvest.py b/pomodoro_to_harvest.py
index dd8a6ab..208fa2e 100644
--- a/pomodoro_to_harvest.py
+++ b/pomodoro_to_harvest.py
@@ -199,6 +199,7 @@ 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())
 
 # Separate Harvest from non-Harvest projects, and also filter out any blank
 # projects, but save those too for a CSV of the excluded items.
@@ -215,9 +216,9 @@ harvest["Client"] = harvest["Project"].map(project_client_mapping)
 harvest.drop(columns = ['started', 'recorded', 'time'], inplace=True)
 
 if not debug:
-    harvest.to_csv('harvest-timesheets.csv', index=False)
-    other.to_csv('personal-other.csv', index=False)
-    unknown.to_csv('unknown.csv', index=False)
+    harvest.to_csv('harvest-timesheets-' + datest + '.csv', index=False)
+    other.to_csv('personal-other-' + datest + '.csv', index=False)
+    unknown.to_csv('unknown-' + datest + '.csv', index=False)
     settings.pomodoro_latest_recorded(latest)
 else:
     hrvst_grouped = hrvst.groupby("project").agg({"time": "sum"})["time"]/60