nixpkgs/pkgs/desktops/plasma-5.4/plasma-desktop/0002-zoneinfo.patch

From decdc77a7e89b6f1bb3d49268b08a43daf4a7147 Mon Sep 17 00:00:00 2001
From: Thomas Tuegel <ttuegel@gmail.com>
Date: Fri, 28 Aug 2015 10:16:53 -0500
Subject: [PATCH 2/3] zoneinfo

---
 kcms/dateandtime/helper.cpp | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/kcms/dateandtime/helper.cpp b/kcms/dateandtime/helper.cpp
index fc4a6b9..7b64d05 100644
--- a/kcms/dateandtime/helper.cpp
+++ b/kcms/dateandtime/helper.cpp
@@ -181,7 +181,12 @@ int ClockHelper::tz( const QString& selectedzone )
 
     val = selectedzone;
 #else
-    QString tz = "/usr/share/zoneinfo/" + selectedzone;
+    // NixOS-specific path
+    QString tz = "/etc/zoneinfo/" + selectedzone;
+    if (!QFile::exists(tz)) {
+      // Standard Linux path
+      tz = "/usr/share/zoneinfo/" + selectedzone;
+    }
 
     if (QFile::exists(tz)) { // make sure the new TZ really exists
         QFile::remove("/etc/localtime");
-- 
2.5.2