diff --git a/sbin/newfs_msdos/mkfs_msdos.c b/sbin/newfs_msdos/mkfs_msdos.c
index b961e25c431..5a6406ce422 100644
--- a/sbin/newfs_msdos/mkfs_msdos.c
+++ b/sbin/newfs_msdos/mkfs_msdos.c
@@ -566,9 +566,17 @@ mkfs_msdos(const char *fname, const char *dtype, const struct msdos_options *op)
     }
     print_bpb(&bpb);
     if (!o.no_create) {
-	gettimeofday(&tv, NULL);
-	now = tv.tv_sec;
-	tm = localtime(&now);
+	if (o.timestamp_set) {
+	    tv.tv_sec = now = o.timestamp;
+	    tv.tv_usec = 0;
+	    tm = gmtime(&now);
+	} else {
+	    gettimeofday(&tv, NULL);
+	    now = tv.tv_sec;
+	    tm = localtime(&now);
+	}
+
+
 	if (!(img = malloc(bpb.bpbBytesPerSec))) {
 	    warn(NULL);
 	    goto done;
diff --git a/sbin/newfs_msdos/mkfs_msdos.h b/sbin/newfs_msdos/mkfs_msdos.h
index 970af3612c9..2f5d7dcb12a 100644
--- a/sbin/newfs_msdos/mkfs_msdos.h
+++ b/sbin/newfs_msdos/mkfs_msdos.h
@@ -42,6 +42,7 @@ AOPT('L', const char *, volume_label, -1, "Volume Label") \
 AOPT('N', bool, no_create, -2, "Don't create filesystem, print params only") \
 AOPT('O', const char *, OEM_string, -1, "OEM string") \
 AOPT('S', uint16_t, bytes_per_sector, 1, "Bytes per sector") \
+AOPT('T', time_t, timestamp, 0, "Timestamp") \
 AOPT('a', uint32_t, sectors_per_fat, 1, "Sectors per FAT") \
 AOPT('b', uint32_t, block_size, 1, "Block size") \
 AOPT('c', uint8_t, sectors_per_cluster, 1, "Sectors per cluster") \
@@ -61,6 +62,7 @@ struct msdos_options {
 #define AOPT(_opt, _type, _name, _min, _desc) _type _name;
 ALLOPTS
 #undef AOPT	
+	uint32_t timestamp_set:1;
 	uint32_t volume_id_set:1;
 	uint32_t media_descriptor_set:1;
 	uint32_t hidden_sectors_set:1;
diff --git a/sbin/newfs_msdos/newfs_msdos.8 b/sbin/newfs_msdos/newfs_msdos.8
index 967e1513556..44d5f21426b 100644
--- a/sbin/newfs_msdos/newfs_msdos.8
+++ b/sbin/newfs_msdos/newfs_msdos.8
@@ -25,7 +25,7 @@
 .\"
 .\" $FreeBSD$
 .\"
-.Dd April 9, 2015
+.Dd May 16, 2017
 .Dt NEWFS_MSDOS 8
 .Os
 .Sh NAME
@@ -55,6 +55,7 @@
 .Op Fl o Ar hidden
 .Op Fl r Ar reserved
 .Op Fl s Ar total
+.Op Fl T Ar timestamp
 .Op Fl u Ar track-size
 .Ar special
 .Op Ar disktype
@@ -159,6 +160,12 @@ Number of hidden sectors.
 Number of reserved sectors.
 .It Fl s Ar total
 File system size.
+.It Fl T Ar timestamp
+Specify a timestamp to be used for filesystem creation so that
+it can be consistent for reproducible builds.
+The timestamp can be a pathname (where the timestamps are derived from
+that file) or an integer value interpreted
+as the number of seconds since the Epoch.
 .It Fl u Ar track-size
 Number of sectors per track.
 .El
diff --git a/sbin/newfs_msdos/newfs_msdos.c b/sbin/newfs_msdos/newfs_msdos.c
index 0d3340d0c3f..5677568c97e 100644
--- a/sbin/newfs_msdos/newfs_msdos.c
+++ b/sbin/newfs_msdos/newfs_msdos.c
@@ -31,7 +31,7 @@ static const char rcsid[] =
 #endif /* not lint */
 
 #include <sys/param.h>
-
+#include <sys/stat.h>
 #include <err.h>
 #include <errno.h>
 #include <paths.h>
@@ -51,13 +51,30 @@ static u_int argtou(const char *, u_int, u_int, const char *);
 static off_t argtooff(const char *, const char *);
 static void usage(void);
 
+static time_t
+get_tstamp(const char *b)
+{
+    struct stat st;
+    char *eb;
+    long long l;
+
+    if (stat(b, &st) != -1)
+        return (time_t)st.st_mtime;
+
+    errno = 0;
+    l = strtoll(b, &eb, 0);
+    if (b == eb || *eb || errno)
+        errx(EXIT_FAILURE, "Can't parse timestamp '%s'", b);
+    return (time_t)l;
+}
+
 /*
  * Construct a FAT12, FAT16, or FAT32 file system.
  */
 int
 main(int argc, char *argv[])
 {
-    static const char opts[] = "@:NB:C:F:I:L:O:S:a:b:c:e:f:h:i:k:m:n:o:r:s:u:";
+    static const char opts[] = "@:NB:C:F:I:L:O:S:a:b:c:e:f:h:i:k:m:n:o:r:s:T:u:";
     struct msdos_options o;
     const char *fname, *dtype;
     char buf[MAXPATHLEN];
@@ -142,6 +159,10 @@ main(int argc, char *argv[])
 	case 's':
 	    o.size = argto4(optarg, 1, "file system size");
 	    break;
+	case 'T':
+	    o.timestamp_set = 1;
+	    o.timestamp = get_tstamp(optarg);
+	    break;
 	case 'u':
 	    o.sectors_per_track = argto2(optarg, 1, "sectors/track");
 	    break;