diff --git a/devel/glib2/Makefile b/devel/glib2/Makefile
index f65479d8f53..0e2692a6f7b 100644
--- a/devel/glib2/Makefile
+++ b/devel/glib2/Makefile
@@ -1,4 +1,4 @@
-# $OpenBSD: Makefile,v 1.313 2019/11/01 19:33:14 ajacoutot Exp $
+# $OpenBSD: Makefile,v 1.314 2019/11/02 11:07:42 ajacoutot Exp $
 
 # Everything is a Freaking GLib/GTK+ problem
 CFLAGS +=		-g
@@ -9,6 +9,7 @@ COMMENT=		general-purpose utility library
 GNOME_PROJECT=		glib
 GNOME_VERSION=		2.62.2
 PKGNAME=		${DISTNAME:S/glib/glib2/}
+REVISION=		0
 
 CATEGORIES=		devel
 
diff --git a/devel/glib2/patches/patch-glib_gtimezone_c b/devel/glib2/patches/patch-glib_gtimezone_c
new file mode 100644
index 00000000000..49a360f0d75
--- /dev/null
+++ b/devel/glib2/patches/patch-glib_gtimezone_c
@@ -0,0 +1,74 @@
+$OpenBSD: patch-glib_gtimezone_c,v 1.1 2019/11/02 11:07:42 ajacoutot Exp $
+
+From 551e83662de9815d161a82c760cfa77995905740 Mon Sep 17 00:00:00 2001
+From: rim <rozhuk.im@gmail.com>
+Date: Fri, 25 Oct 2019 17:27:49 +0000
+Subject: [PATCH] gtimezone: Cache UTC and local TZ indefinitely
+
+Index: glib/gtimezone.c
+--- glib/gtimezone.c.orig
++++ glib/gtimezone.c
+@@ -37,6 +37,7 @@
+ #include "gslice.h"
+ #include "gdatetime.h"
+ #include "gdate.h"
++#include "genviron.h"
+ 
+ #ifdef G_OS_WIN32
+ 
+@@ -196,6 +197,8 @@ struct _GTimeZone
+ 
+ G_LOCK_DEFINE_STATIC (time_zones);
+ static GHashTable/*<string?, GTimeZone>*/ *time_zones;
++G_LOCK_DEFINE_STATIC (tz_local);
++static GTimeZone *tz_local = NULL;
+ 
+ #define MIN_TZYEAR 1916 /* Daylight Savings started in WWI */
+ #define MAX_TZYEAR 2999 /* And it's not likely ever to go away, but
+@@ -1656,10 +1659,20 @@ g_time_zone_new (const gchar *identifier)
+  *
+  * Since: 2.26
+  **/
++static gpointer
++g_time_zone_utc_init (gpointer data)
++{
++  return g_time_zone_new ("UTC");
++}
++
+ GTimeZone *
+ g_time_zone_new_utc (void)
+ {
+-  return g_time_zone_new ("UTC");
++  static GOnce utc_once = G_ONCE_INIT;
++
++  g_once (&utc_once, g_time_zone_utc_init, NULL);
++
++  return g_time_zone_ref ((GTimeZone *)utc_once.retval);
+ }
+ 
+ /**
+@@ -1682,7 +1695,23 @@ g_time_zone_new_utc (void)
+ GTimeZone *
+ g_time_zone_new_local (void)
+ {
+-  return g_time_zone_new (getenv ("TZ"));
++  const gchar *tzenv = g_getenv ("TZ");
++  GTimeZone *tz;
++
++  G_LOCK (tz_local);
++
++  /* Is time zone changed and must be flushed? */
++  if (tz_local && g_strcmp0 (g_time_zone_get_identifier (tz_local), tzenv))
++    g_clear_pointer (&tz_local, g_time_zone_unref);
++
++  if (tz_local == NULL)
++    tz_local = g_time_zone_new (tzenv);
++
++  tz = g_time_zone_ref (tz_local);
++
++  G_UNLOCK (tz_local);
++
++  return tz;
+ }
+ 
+ /**