--- glib/gtimezone.c.orig	2018-09-21 12:29:23.000000000 +0300

+++ glib/gtimezone.c	2019-09-12 00:53:42.760936000 +0300

@@ -187,6 +187,8 @@

 G_LOCK_DEFINE_STATIC (time_zones);

 static GHashTable/*<string?, GTimeZone>*/ *time_zones;

+static GTimeZone *tz_utc = NULL;

+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

@@ -264,6 +266,8 @@

 GTimeZone *

 g_time_zone_ref (GTimeZone *tz)

 {

+  if (tz == NULL)

+    return NULL;

   g_assert (tz->ref_count > 0);

   g_atomic_int_inc (&tz->ref_count);

@@ -1460,7 +1464,10 @@

 GTimeZone *

 g_time_zone_new_utc (void)

 {

-  return g_time_zone_new ("UTC");

+  if (tz_utc == NULL) {

+    tz_utc = g_time_zone_new ("UTC");

+  }

+  return g_time_zone_ref(tz_utc);

 }

 /**

@@ -1483,7 +1490,10 @@

 GTimeZone *

 g_time_zone_new_local (void)

 {

-  return g_time_zone_new (getenv ("TZ"));

+  if (tz_local == NULL) {

+    tz_local = g_time_zone_new (getenv ("TZ"));

+  }

+  return g_time_zone_ref(tz_local);

 }

 #define TRANSITION(n)         g_array_index (tz->transitions, Transition, n)