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diff --git a/lib/libutil/Makefile b/lib/libutil/Makefile
--- a/lib/libutil/Makefile
+++ b/lib/libutil/Makefile
@@ -18,7 +18,7 @@
login_class.c login_crypt.c login_ok.c login_times.c login_tty.c \
mntopts.c \
pidfile.c property.c pty.c pw_scan.c pw_util.c quotafile.c \
- realhostname.c stub.c trimdomain.c uucplock.c
+ realhostname.c source_date_epoch.c stub.c trimdomain.c uucplock.c
INCS= libutil.h login_cap.h mntopts.h
CFLAGS+= -DNO__SCCSID
diff --git a/lib/libutil/libutil.h b/lib/libutil/libutil.h
--- a/lib/libutil/libutil.h
+++ b/lib/libutil/libutil.h
@@ -63,6 +63,11 @@
#define _SIZE_T_DECLARED
#endif
+#ifndef _TIME_T_DECLARED
+typedef __time_t time_t;
+#define _TIME_T_DECLARED
+#endif
+
#ifndef _UID_T_DECLARED
typedef __uid_t uid_t;
#define _UID_T_DECLARED
@@ -133,6 +138,7 @@
int realhostname_sa(char *_host, size_t _hsize, struct sockaddr *_addr,
int _addrlen);
int _secure_path(const char *_path, uid_t _uid, gid_t _gid);
+int source_date_epoch(time_t *tp);
void trimdomain(char *_fullhost, int _hostsize);
const char *
uu_lockerr(int _uu_lockresult);
diff --git a/lib/libutil/source_date_epoch.c b/lib/libutil/source_date_epoch.c
new file mode 100644
--- /dev/null
+++ b/lib/libutil/source_date_epoch.c
@@ -0,0 +1,46 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * Copyright (c) 2025 Klara, Inc.
+ */
+
+#include <sys/types.h>
+
+#include <errno.h>
+#include <inttypes.h>
+#include <libutil.h>
+#include <limits.h>
+#include <stdlib.h>
+
+int
+source_date_epoch(time_t *tp)
+{
+ intmax_t val;
+ char *end, *env;
+
+ env = getenv("SOURCE_DATE_EPOCH");
+ if (env == NULL)
+ return (1);
+
+ errno = 0;
+ val = strtoimax(env, &end, 10);
+ if (errno != 0)
+ return (-1);
+ if (end == env || *end != '\0') {
+ errno = EINVAL;
+ return (-1);
+ }
+
+ /* Check for truncation. Unfortunately there is no TIME_T_MAX. */
+ _Static_assert(sizeof(time_t) == sizeof(int32_t) ||
+ sizeof(time_t) == sizeof(int64_t),
+ "time_t must be 32 or 64 bits");
+ if (val < 0 || (sizeof(time_t) == sizeof(int32_t) && val > INT32_MAX) ||
+ (sizeof(time_t) == sizeof(int64_t) && val > INT64_MAX)) {
+ errno = ERANGE;
+ return (-1);
+ }
+
+ *tp = (time_t)val;
+ return (0);
+}

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