diff --git a/NEWS b/NEWS
index da4b2223e9..cf6078cf20 100644
--- a/NEWS
+++ b/NEWS
@@ -28,7 +28,14 @@ Major new features:
 
 Deprecated and removed features, and other changes affecting compatibility:
 
-  [Add deprecations, removals and changes affecting compatibility here]
+* Architectures which use a 32-bit seconds-since-epoch field in struct
+  lastlog, struct utmp, struct utmpx (such as i386, powerpc64le, rv32,
+  rv64, x86-64) switched from a signed to an unsigned type for that
+  field.  This allows these fields to store timestamps beyond the year
+  2038, until the year 2106.  Please note that applications are still
+  expected to migrate off the interfaces declared in <utmp.h> and
+  <utmpx.h> (except for login_tty) due to locking and session management
+  problems.
 
 Changes to build and runtime requirements:
 
diff --git a/bits/utmp.h b/bits/utmp.h
index f2d1c13d8c..27cb536800 100644
--- a/bits/utmp.h
+++ b/bits/utmp.h
@@ -36,7 +36,7 @@
 struct lastlog
   {
 #if __WORDSIZE_TIME64_COMPAT32
-    int32_t ll_time;
+    __uint32_t ll_time;
 #else
     __time_t ll_time;
 #endif
@@ -76,7 +76,7 @@ struct utmp
   int32_t ut_session;		/* Session ID, used for windowing.  */
   struct
   {
-    int32_t tv_sec;		/* Seconds.  */
+    __uint32_t tv_sec;		/* Seconds.  */
     int32_t tv_usec;		/* Microseconds.  */
   } ut_tv;			/* Time entry was made.  */
 #else
diff --git a/login/Makefile b/login/Makefile
index f91190e3dc..84563230ef 100644
--- a/login/Makefile
+++ b/login/Makefile
@@ -44,9 +44,11 @@ subdir-dirs = programs
 vpath %.c programs
 
 tests := tst-utmp tst-utmpx tst-grantpt tst-ptsname tst-getlogin tst-updwtmpx \
-  tst-pututxline-lockfail tst-pututxline-cache tst-utmp-size tst-utmp-size-64
+  tst-pututxline-lockfail tst-pututxline-cache tst-utmp-size tst-utmp-size-64 \
+  tst-utmp-unsigned tst-utmp-unsigned-64
 
 CFLAGS-tst-utmp-size-64.c += -D_FILE_OFFSET_BITS=64 -D_TIME_BITS=64
+CFLAGS-tst-utmp-unsigned-64.c += -D_FILE_OFFSET_BITS=64 -D_TIME_BITS=64
 
 # Empty compatibility library for old binaries.
 extra-libs      := libutil
diff --git a/login/tst-utmp-unsigned-64.c b/login/tst-utmp-unsigned-64.c
new file mode 100644
index 0000000000..940e7654f8
--- /dev/null
+++ b/login/tst-utmp-unsigned-64.c
@@ -0,0 +1 @@
+#include "tst-utmp-unsigned.c"
diff --git a/login/tst-utmp-unsigned.c b/login/tst-utmp-unsigned.c
new file mode 100644
index 0000000000..27ad03a7d6
--- /dev/null
+++ b/login/tst-utmp-unsigned.c
@@ -0,0 +1,40 @@
+/* Check that struct utmp, struct utmpx, struct lastlog use unsigned epoch.
+   Copyright (C) 2024 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+#include <utmp.h>
+#include <utmpx.h>
+#include <utmp-size.h>
+
+/* Undefined.  Used to check that the conditions below are optimized away.  */
+void link_failure_utmp (void);
+void link_failure_utmpx (void);
+void link_failure_lastlog (void);
+
+static int
+do_test (void)
+{
+  if ((struct utmp) { .ut_tv = { 0x80000000U, }, }.ut_tv.tv_sec <= 0)
+    link_failure_utmp ();
+  if ((struct utmpx) { .ut_tv = { 0x80000000U, }, }.ut_tv.tv_sec <= 0)
+    link_failure_utmpx ();
+  if ((struct lastlog) { .ll_time = 0x80000000U, }.ll_time <= 0)
+    link_failure_lastlog ();
+  return 0;
+}
+
+#include <support/test-driver.c>
diff --git a/sysdeps/gnu/bits/utmpx.h b/sysdeps/gnu/bits/utmpx.h
index 34b4afbc6a..ed0df9bd81 100644
--- a/sysdeps/gnu/bits/utmpx.h
+++ b/sysdeps/gnu/bits/utmpx.h
@@ -74,7 +74,7 @@ struct utmpx
   __int32_t ut_session;		/* Session ID, used for windowing.  */
   struct
   {
-    __int32_t tv_sec;		/* Seconds.  */
+    __uint32_t tv_sec;		/* Seconds.  */
     __int32_t tv_usec;		/* Microseconds.  */
   } ut_tv;			/* Time entry was made.  */
 #else