diff --git a/qse/configure b/qse/configure
index 6d466d84..a6a92b37 100755
--- a/qse/configure
+++ b/qse/configure
@@ -19904,6 +19904,39 @@ cat >>confdefs.h <<_ACEOF
 _ACEOF
 
 
+fi
+
+ac_fn_c_check_member "$LINENO" "struct tm" "__tm_gmtoff" "ac_cv_member_struct_tm___tm_gmtoff" "#include <time.h>
+"
+if test "x$ac_cv_member_struct_tm___tm_gmtoff" = xyes; then :
+
+cat >>confdefs.h <<_ACEOF
+#define HAVE_STRUCT_TM___TM_GMTOFF 1
+_ACEOF
+
+
+fi
+
+ac_fn_c_check_member "$LINENO" "struct tm" "tm_zone" "ac_cv_member_struct_tm_tm_zone" "#include <time.h>
+"
+if test "x$ac_cv_member_struct_tm_tm_zone" = xyes; then :
+
+cat >>confdefs.h <<_ACEOF
+#define HAVE_STRUCT_TM_TM_ZONE 1
+_ACEOF
+
+
+fi
+
+ac_fn_c_check_member "$LINENO" "struct tm" "__tm_zone" "ac_cv_member_struct_tm___tm_zone" "#include <time.h>
+"
+if test "x$ac_cv_member_struct_tm___tm_zone" = xyes; then :
+
+cat >>confdefs.h <<_ACEOF
+#define HAVE_STRUCT_TM___TM_ZONE 1
+_ACEOF
+
+
 fi
 
 
diff --git a/qse/configure.ac b/qse/configure.ac
index c43f00be..0053a7fa 100644
--- a/qse/configure.ac
+++ b/qse/configure.ac
@@ -328,6 +328,9 @@ AC_CHECK_MEMBERS([struct stat.st_birthtim.tv_nsec])
 AC_CHECK_MEMBERS([struct stat.st_mtimespec.tv_nsec])
 AC_CHECK_MEMBERS([struct stat.st_birthtimespec.tv_nsec])
 AC_CHECK_MEMBERS([struct tm.tm_gmtoff],,,[[#include <time.h>]])
+AC_CHECK_MEMBERS([struct tm.__tm_gmtoff],,,[[#include <time.h>]])
+AC_CHECK_MEMBERS([struct tm.tm_zone],,,[[#include <time.h>]])
+AC_CHECK_MEMBERS([struct tm.__tm_zone],,,[[#include <time.h>]])
 
 
 AC_CHECK_MEMBERS([struct ifreq.ifr_ifindex, struct ifreq.ifr_mtu], [], [],
diff --git a/qse/include/qse/config.h.in b/qse/include/qse/config.h.in
index 1dd5bc12..0657d78e 100644
--- a/qse/include/qse/config.h.in
+++ b/qse/include/qse/config.h.in
@@ -601,6 +601,15 @@
 /* Define to 1 if `tm_gmtoff' is a member of `struct tm'. */
 #undef HAVE_STRUCT_TM_TM_GMTOFF
 
+/* Define to 1 if `tm_zone' is a member of `struct tm'. */
+#undef HAVE_STRUCT_TM_TM_ZONE
+
+/* Define to 1 if `__tm_gmtoff' is a member of `struct tm'. */
+#undef HAVE_STRUCT_TM___TM_GMTOFF
+
+/* Define to 1 if `__tm_zone' is a member of `struct tm'. */
+#undef HAVE_STRUCT_TM___TM_ZONE
+
 /* Define to 1 if you have the `swapcontext' function. */
 #undef HAVE_SWAPCONTEXT
 
diff --git a/qse/lib/awk/mod-sys.c b/qse/lib/awk/mod-sys.c
index 118f105a..517b0946 100644
--- a/qse/lib/awk/mod-sys.c
+++ b/qse/lib/awk/mod-sys.c
@@ -746,7 +746,17 @@ static int fnc_strftime (qse_awk_rtx_t* rtx, const qse_awk_fnc_info_t* fi)
 			tm.tm_isdst = bt.isdst;
 		#if defined(HAVE_STRUCT_TM_TM_GMTOFF)
 			tm.tm_gmtoff = bt.gmtoff;
+		#elif defined(HAVE_STRUCT_TM___TM_GMTOFF)
+			tm.__tm_gmtoff = bt.gmtoff;
 		#endif
+			if (flags & STRFTIME_UTC)
+			{
+			#if defined(HAVE_STRUCT_TM_TM_ZONE)
+				tm.tm_zone = "GMT";
+			#elif defined(HAVE_STRUCT_TM___TM_ZONE)
+				tm.__tm_zone = "GMT";
+			#endif
+			}
 
 			sl = strftime(tmpbuf, QSE_COUNTOF(tmpbuf), fmt, &tm);
 			if (sl <= 0 || sl >= QSE_COUNTOF(tmpbuf))
diff --git a/qse/lib/cmn/time.c b/qse/lib/cmn/time.c
index 3f8dee47..119d03f9 100644
--- a/qse/lib/cmn/time.c
+++ b/qse/lib/cmn/time.c
@@ -393,6 +393,8 @@ int qse_gmtime (const qse_ntime_t* nt, qse_btime_t* bt)
 	bt->isdst = tm->tm_isdst;
 #if defined(HAVE_STRUCT_TM_TM_GMTOFF)
 	bt->gmtoff = tm->tm_gmtoff;
+#elif defined(HAVE_STRUCT_TM___TM_GMTOFF)
+	bt->gmtoff = tm->__tm_gmtoff;
 #endif
 
 	return 0;
@@ -444,6 +446,8 @@ int qse_localtime (const qse_ntime_t* nt, qse_btime_t* bt)
 	bt->isdst = tm->tm_isdst;
 #if defined(HAVE_STRUCT_TM_TM_GMTOFF)
 	bt->gmtoff = tm->tm_gmtoff;
+#elif defined(HAVE_STRUCT_TM___TM_GMTOFF)
+	bt->gmtoff = tm->__tm_gmtoff;
 #else
 	bt->gmtoff = QSE_TYPE_MIN(int); /* unknown */
 #endif
@@ -493,6 +497,8 @@ int qse_timegm (const qse_btime_t* bt, qse_ntime_t* nt)
 	tm.tm_isdst = bt->isdst;
 #if defined(HAVE_STRUCT_TM_TM_GMTOFF)
 	tm->tm_gmtoff = bt->gmtoff; /* i don't think this is needed. but just keep it */
+#elif defined(HAVE_STRUCT_TM___TM_GMTOFF)
+	tm->__tm_gmtoff = bt->gmtoff;
 #endif
 
 #if defined(HAVE_TIMEGM)
@@ -582,6 +588,8 @@ int qse_timelocal (const qse_btime_t* bt, qse_ntime_t* nt)
 	tm.tm_isdst = bt->isdst;
 #if defined(HAVE_STRUCT_TM_TM_GMTOFF)
 	tm.tm_gmtoff = bt->gmtoff; /* i don't think this is needed. but just keep it */
+#elif defined(HAVE_STRUCT_TM___TM_GMTOFF)
+	tm->__tm_gmtoff = bt->gmtoff;
 #endif
 
 #if defined(HAVE_TIMELOCAL)