--- /sys/src/cmd/fossil/9fsys.c
+++ /sys/src/cmd/fossil/9fsys.c
@@ -369,11 +369,13 @@ static int
 fsysSnap(Fsys* fsys, int argc, char* argv[])
 {
 	int doarchive;
-	char *usage = "usage: [fsys name] snap [-a] [-s /active] [-d /archive/yyyy/mmmm]";
-	char *src, *dst;
+	char *usage = "usage: [fsys name] snap [-a] [-s /active] [-d /archive/yyyy/mmmm] [-t time]";
+	char *src, *dst, *p;
+	ulong t;
 
 	src = nil;
 	dst = nil;
+	t = 0;
 	doarchive = 0;
 	ARGBEGIN{
 	default:
@@ -389,11 +391,17 @@ fsysSnap(Fsys* fsys, int argc, char* argv[])
 		if((src = ARGF()) == nil)
 			return cliError(usage);
 		break;
+	case 't':
+		p = ARGF();
+		if(p == nil)
+			return cliError(usage);
+		t = strtoul(argv[0], &p, 0);
+		break;
 	}ARGEND
 	if(argc)
 		return cliError(usage);
 
-	if(!fsSnapshot(fsys->fs, src, dst, doarchive))
+	if(!fsSnapshot(fsys->fs, src, dst, doarchive, t))
 		return 0;
 
 	return 1;
@@ -1125,7 +1133,7 @@ fsysCreate(Fsys* fsys, int argc, char* argv[])
 	if((parent = fileOpen(fsys->fs, p)) == nil)
 		goto out;
 
-	file = fileCreate(parent, elem, mode, argv[1]);
+	file = fileCreate(parent, elem, mode, argv[1], 0);
 	fileDecRef(parent);
 	if(file == nil){
 		werrstr("create %s/%s: %r", p, elem);
--- /sys/src/cmd/fossil/9p.c
+++ /sys/src/cmd/fossil/9p.c
@@ -641,7 +641,7 @@ rTcreate(Msg* m)
 	if(m->t.perm & DMTMP)
 		mode |= ModeTemporary;
 
-	if((file = fileCreate(fid->file, m->t.name, mode, fid->uid)) == nil){
+	if((file = fileCreate(fid->file, m->t.name, mode, fid->uid, 0)) == nil){
 		fidPut(fid);
 		return 0;
 	}
--- /sys/src/cmd/fossil/9user.c
+++ /sys/src/cmd/fossil/9user.c
@@ -391,13 +391,13 @@ usersFileWrite(Ubox* box)
 	if((dir = fileOpen(fs, "/active")) == nil)
 		goto tidy0;
 	if((file = fileWalk(dir, uidadm)) == nil)
-		file = fileCreate(dir, uidadm, ModeDir|0775, uidadm);
+		file = fileCreate(dir, uidadm, ModeDir|0775, uidadm, 0);
 	fileDecRef(dir);
 	if(file == nil)
 		goto tidy;
 	dir = file;
 	if((file = fileWalk(dir, "users")) == nil)
-		file = fileCreate(dir, "users", 0664, uidadm);
+		file = fileCreate(dir, "users", 0664, uidadm, 0);
 	fileDecRef(dir);
 	if(file == nil)
 		goto tidy;
--- /sys/src/cmd/fossil/file.c
+++ /sys/src/cmd/fossil/file.c
@@ -405,7 +405,7 @@ fileSetTmp(File *f, int istmp)
 }
 
 File *
-fileCreate(File *f, char *elem, ulong mode, char *uid)
+fileCreate(File *f, char *elem, ulong mode, char *uid, ulong t)
 {
 	File *ff;
 	DirEntry *dir;
@@ -466,7 +466,9 @@ fileCreate(File *f, char *elem, ulong mode, char *uid)
 	dir->uid = vtstrdup(uid);
 	dir->gid = vtstrdup(f->dir.gid);
 	dir->mid = vtstrdup(uid);
-	dir->mtime = time(0L);
+	if (t == 0)
+		t = time(0L);
+	dir->mtime = t;
 	dir->mcount = 0;
 	dir->ctime = dir->mtime;
 	dir->atime = dir->mtime;
--- /sys/src/cmd/fossil/flfmt.c
+++ /sys/src/cmd/fossil/flfmt.c
@@ -414,7 +414,7 @@ addFile(File *root, char *name, uint mode)
 {
 	File *f;
 
-	f = fileCreate(root, name, mode | ModeDir, "adm");
+	f = fileCreate(root, name, mode | ModeDir, "adm", 0);
 	if(f == nil)
 		sysfatal("could not create file: %s: %r", name);
 	fileDecRef(f);
--- /sys/src/cmd/fossil/flfmt9660.c
+++ /sys/src/cmd/fossil/flfmt9660.c
@@ -379,7 +379,7 @@ iso9660copy(Fs *fs)
 	iso9660copydir(fs, root, (Cdir*)v->rootdir);
 	fileDecRef(root);
 	runlock(&fs->elk);
-	if(!fsSnapshot(fs, nil, nil, 0))
+	if(!fsSnapshot(fs, nil, nil, 0, 0))
 		sysfatal("snapshot failed: %r");
 	rlock(&fs->elk);
 }
@@ -536,7 +536,7 @@ if(d.mode&DMDIR)	print("%*scopy %s %s %s %luo\n", ind*2, "", d.name, d.uid, d.gi
 	mode = d.mode&0777;
 	if(d.mode&DMDIR)
 		mode |= ModeDir;
-	if((f = fileCreate(dir, d.name, mode, d.uid)) == nil)
+	if((f = fileCreate(dir, d.name, mode, d.uid, 0)) == nil)
 		sysfatal("could not create file '%s': %r", d.name);
 	if(d.mode&DMDIR)
 		iso9660copydir(fs, f, c);
--- /sys/src/cmd/fossil/fs.h
+++ /sys/src/cmd/fossil/fs.h
@@ -29,7 +29,7 @@ int	fsHalt(Fs*);
 Fs	*fsOpen(char*, VtConn*, long, int);
 int	fsRedial(Fs*, char*);
 void	fsSnapshotCleanup(Fs*, u32int);
-int	fsSnapshot(Fs*, char*, char*, int);
+int	fsSnapshot(Fs*, char*, char*, int, ulong);
 void	fsSnapshotRemove(Fs*);
 int	fsSync(Fs*);
 int	fsUnhalt(Fs*);
@@ -40,7 +40,7 @@ DirEntryEnum *deeOpen(File*);
 int	deeRead(DirEntryEnum*, DirEntry*);
 int	fileClri(File*, char*, char*);
 int	fileClriPath(Fs*, char*, char*);
-File	*fileCreate(File*, char*, ulong, char*);
+File	*fileCreate(File*, char*, ulong, char*, ulong);
 int	fileDecRef(File*);
 int	fileGetDir(File*, DirEntry*);
 uvlong	fileGetId(File*);