diff --git a/src/routers/dashboard.py b/src/routers/dashboard.py
index dcba3f5..017bf27 100644
--- a/src/routers/dashboard.py
+++ b/src/routers/dashboard.py
@@ -368,30 +368,24 @@ async def project_detail(
         from fastapi import HTTPException
         raise HTTPException(status_code=404, detail="Project not found")
 
-    from_date, to_date = _date_range(from_date, to_date)
+    # When no date range given, show all-time data for the project
+    date_filter_given = from_date is not None or to_date is not None
+    if date_filter_given:
+        from_date, to_date = _date_range(from_date, to_date)
+
+    stats_where = [DailyStat.user_id == user.id, DailyStat.project_id == project_id]
+    sessions_where = [Session.user_id == user.id, Session.project_id == project_id]
+    if date_filter_given:
+        stats_where += [DailyStat.date >= from_date, DailyStat.date <= to_date]
+        sessions_where += [Session.date >= from_date, Session.date <= to_date]
 
     stats_result = await db.execute(
-        select(DailyStat)
-        .where(
-            DailyStat.user_id == user.id,
-            DailyStat.project_id == project_id,
-            DailyStat.date >= from_date,
-            DailyStat.date <= to_date,
-        )
-        .order_by(DailyStat.date)
+        select(DailyStat).where(*stats_where).order_by(DailyStat.date)
     )
     stats = stats_result.scalars().all()
 
     sessions_result = await db.execute(
-        select(Session)
-        .where(
-            Session.user_id == user.id,
-            Session.project_id == project_id,
-            Session.date >= from_date,
-            Session.date <= to_date,
-        )
-        .order_by(Session.start_at.desc())
-        .limit(200)
+        select(Session).where(*sessions_where).order_by(Session.start_at.desc()).limit(200)
     )
     sessions = sessions_result.scalars().all()