From 690278127ce659560bc9900dc8f6064191c0b67c Mon Sep 17 00:00:00 2001
From: edtechre <edtechre@gmail.com>
Date: Fri, 17 Mar 2023 12:36:37 -0700
Subject: [PATCH] Guarantee exit dates are in sorted order.

---
 src/pybroker/strategy.py | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/pybroker/strategy.py b/src/pybroker/strategy.py
index 279207b..e50702a 100644
--- a/src/pybroker/strategy.py
+++ b/src/pybroker/strategy.py
@@ -1208,9 +1208,11 @@ def _run_walkforward(
             for sym in exec.symbols:
                 sessions[ExecSymbol(exec.id, sym)] = {}
                 if self._config.exit_on_last_bar:
-                    exit_dates[sym] = df[df[DataCol.SYMBOL.value] == sym][
+                    sym_dates = df[df[DataCol.SYMBOL.value] == sym][
                         DataCol.DATE.value
-                    ].values[-1]
+                    ].values
+                    sym_dates.sort()
+                    exit_dates[sym] = sym_dates[-1]
         for train_idx, test_idx in self.walkforward_split(
             df=df,
             windows=windows,