From 1eeb4cd6522da8c05ccadf3868a076ba1856e61e Mon Sep 17 00:00:00 2001
From: Howard Hinnant <howard.hinnant@gmail.com>
Date: Fri, 8 Dec 2017 13:08:40 -0500
Subject: [PATCH] Prepare for the new definition of IST

* Irish Standard Time has a -1h save in the winter instead
  of a +1h save in the summer.
---
 src/tz.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/tz.cpp b/src/tz.cpp
index 3dda0e4..60a8e81 100644
--- a/src/tz.cpp
+++ b/src/tz.cpp
@@ -1112,7 +1112,7 @@ detail::Rule::Rule(const std::string& s)
         in >> abbrev_;
         if (abbrev_ == "-")
             abbrev_.clear();
-        assert(hours{0} <= save_ && save_ <= hours{2});
+        assert(hours{-1} <= save_ && save_ <= hours{2});
     }
     catch (...)
     {