1 files changed, 5 insertions, 3 deletions

diff --git a/lisp/timezone.el b/lisp/timezone.el
index 8f21f8f3765..d6473158f36 100644
--- a/lisp/timezone.el
+++ b/lisp/timezone.el
@@ -197,8 +197,8 @@ Understands the following styles:
     (when year
       (setq year (match-string year date))
       ;; Guess ambiguous years.  Assume years < 69 don't predate the
-      ;; Unix Epoch, so are 2000+.  Three-digit years -- do they ever
-      ;; occur? -- are (arbitrarily) assumed to be 21st century.
+      ;; Unix Epoch, so are 2000+.  Three-digit years are assumed to
+      ;; be relative to 1900.
       (if (< (length year) 4)
           (let ((y (string-to-int year)))
             (if (< y 69)
@@ -310,10 +310,12 @@ If LOCAL is nil, it is assumed to be GMT.
 If TIMEZONE is nil, use the local time zone."
   (let* ((date   (timezone-parse-date date))
          (year   (string-to-int (aref date 0)))
-         (year   (cond ((< year 50)
+         (year   (cond ((< year 69)
                         (+ year 2000))
                        ((< year 100)
                         (+ year 1900))
+                       ((< year 1000)   ; possible 3-digit years.
+                        (+ year 1900))
                        (t year)))
          (month  (string-to-int (aref date 1)))
          (day    (string-to-int (aref date 2)))