diff --git a/ObsoleteFiles.inc b/ObsoleteFiles.inc
--- a/ObsoleteFiles.inc
+++ b/ObsoleteFiles.inc
@@ -52,6 +52,9 @@
 #   xargs -n1 | sort | uniq -d;
 # done
 
+# 20230306: remove tzsetwall(3)
+OLD_FILES+=usr/share/man/man3/tzsetwall.3.gz
+
 # 20230208: new clang import which bumps version from 14.0.5 to 15.0.7
 OLD_FILES+=usr/lib/clang/14.0.5/include/cuda_wrappers/algorithm
 OLD_FILES+=usr/lib/clang/14.0.5/include/cuda_wrappers/complex
diff --git a/include/time.h b/include/time.h
--- a/include/time.h
+++ b/include/time.h
@@ -169,7 +169,6 @@
 
 #if __BSD_VISIBLE
 char *timezone(int, int);	/* XXX XSI conflict */
-void tzsetwall(void);
 time_t timelocal(struct tm * const);
 time_t timegm(struct tm * const);
 int timer_oshandle_np(timer_t timerid);
diff --git a/lib/libc/gen/Makefile.inc b/lib/libc/gen/Makefile.inc
--- a/lib/libc/gen/Makefile.inc
+++ b/lib/libc/gen/Makefile.inc
@@ -547,7 +547,6 @@
 	tcsetattr.3 tcgetattr.3
 MLINKS+=ttyname.3 isatty.3 \
 	ttyname.3 ttyname_r.3
-MLINKS+=tzset.3 tzsetwall.3
 MLINKS+=unvis.3 strunvis.3 \
 	unvis.3 strunvisx.3
 MLINKS+=vis.3 nvis.3 \
diff --git a/lib/libc/gen/tzset.3 b/lib/libc/gen/tzset.3
--- a/lib/libc/gen/tzset.3
+++ b/lib/libc/gen/tzset.3
@@ -31,12 +31,11 @@
 .\"	@(#)tzset.3	8.2 (Berkeley) 11/17/93
 .\" $FreeBSD$
 .\"
-.Dd February 8, 2023
+.Dd March 6, 2023
 .Dt TZSET 3
 .Os
 .Sh NAME
-.Nm tzset ,
-.Nm tzsetwall
+.Nm tzset
 .Nd initialize time conversion information
 .Sh LIBRARY
 .Lb libc
@@ -44,8 +43,6 @@
 .In time.h
 .Ft void
 .Fn tzset void
-.Ft void
-.Fn tzsetwall void
 .Sh DESCRIPTION
 The
 .Fn tzset
@@ -99,17 +96,6 @@
 file and cannot be interpreted as a direct specification,
 .Tn UTC
 is used.
-.Pp
-The
-.Fn tzsetwall
-function is equivalent to calling
-.Fn tzset
-with the
-.Ev TZ
-environment variable unset.
-It is deprecated and may not be available in
-.Fx 14.0
-and later.
 .Sh SPECIFICATION FORMAT
 When
 .Ev TZ
@@ -336,7 +322,5 @@
 .Sh HISTORY
 The
 .Fn tzset
-and
-.Fn tzsetwall
-functions first appeared in
+function first appeared in
 .Bx 4.4 .
diff --git a/lib/libc/stdtime/ctime.3 b/lib/libc/stdtime/ctime.3
--- a/lib/libc/stdtime/ctime.3
+++ b/lib/libc/stdtime/ctime.3
@@ -30,7 +30,7 @@
 .\"     From: @(#)ctime.3	8.1 (Berkeley) 6/4/93
 .\" $FreeBSD$
 .\"
-.Dd September 16, 2022
+.Dd March 6, 2023
 .Dt CTIME 3
 .Os
 .Sh NAME
@@ -395,9 +395,7 @@
 structure points to a static array of characters,
 which will also be overwritten by any subsequent calls (as well as by
 subsequent calls to
-.Xr tzset 3
-and
-.Xr tzsetwall 3 ) .
+.Xr tzset 3 ) .
 .Pp
 Use of the external variable
 .Fa tzname