From 547ecfb28f20958ea76bcd5ce12652b000852933 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Steffen=20Sch=C3=BCmann?= <s.schuemann@pobox.com>
Date: Sat, 4 May 2019 08:08:04 +0200
Subject: [PATCH] Test helper for file_time_type got additional error checking

---
 test/filesystem_test.cpp | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/test/filesystem_test.cpp b/test/filesystem_test.cpp
index faaa905..a1b3f8b 100644
--- a/test/filesystem_test.cpp
+++ b/test/filesystem_test.cpp
@@ -117,9 +117,15 @@ struct StringMaker<fs::file_time_type>
     static std::string convert(fs::file_time_type const& value)
     {
         std::time_t t = to_time_t(value);
-        std::tm ttm = *std::localtime(&t);
-        std::ostringstream os;
-        os << std::put_time(&ttm, "%Y-%m-%d %H:%M:%S");
+        std::tm* ptm = std::localtime(&t);
+        if (ptm) {
+            std::tm ttm = *ptm;
+            std::ostringstream os;
+            os << std::put_time(&ttm, "%Y-%m-%d %H:%M:%S");
+        }
+        else {
+            os << "(invalid-time)";
+        }
         return os.str();
     }
 };