diff --git a/src/undo.c b/src/undo.c
index 57c3c20..607f35f 100644
--- a/src/undo.c
+++ b/src/undo.c
@@ -2298,10 +2298,8 @@
     }
     else
     {
-	/* When doing computations with time_t subtract starttime, because
-	 * time_t converted to a long may result in a wrong number. */
 	if (dosec)
-	    target = (long)(curbuf->b_u_time_cur - starttime) + step;
+	    target = (long)(curbuf->b_u_time_cur) + step;
 	else if (dofile)
 	{
 	    if (step < 0)
@@ -2350,7 +2348,7 @@
 	else
 	{
 	    if (dosec)
-		closest = (long)(vim_time() - starttime + 1);
+		closest = (long)(vim_time() + 1);
 	    else if (dofile)
 		closest = curbuf->b_u_save_nr_last + 2;
 	    else
@@ -2388,7 +2386,7 @@
 	{
 	    uhp->uh_walk = mark;
 	    if (dosec)
-		val = (long)(uhp->uh_time - starttime);
+		val = (long)(uhp->uh_time);
 	    else if (dofile)
 		val = uhp->uh_save_nr;
 	    else