[Emacs-diffs] master b1bb791: Fix probing for pre-1970 DST

[Paul Eggert]

branch: master
commit b1bb7917c15f880dc1c913a1e7c150396af873dc
Author: Paul Eggert <address@hidden>
Commit: Paul Eggert <address@hidden>

    Fix probing for pre-1970 DST
    
    * lisp/calendar/cal-dst.el (calendar-next-time-zone-transition):
    Fix recently-introduced rounding bug when probing for DST
    transitions before 1970 (Bug#33380).
---
 lisp/calendar/cal-dst.el | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lisp/calendar/cal-dst.el b/lisp/calendar/cal-dst.el
index 25264bd..8392e81 100644
--- a/lisp/calendar/cal-dst.el
+++ b/lisp/calendar/cal-dst.el
@@ -154,7 +154,7 @@ Return nil if no such transition can be found."
        (while
            ;; Set PROBE to halfway between LO and HI, rounding down.
            ;; If PROBE equals LO, we are done.
-           (not (= lo (setq probe (/ (+ lo hi) 2))))
+           (not (= lo (setq probe (floor (+ lo hi) 2))))
          ;; Set either LO or HI to PROBE, depending on probe results.
          (if (eq (car (current-time-zone probe)) hi-utc-diff)
              (setq hi probe)