diff --git a/collects/srfi/19/time.rkt b/collects/srfi/19/time.rkt
index 7958c2af90..218be5d32e 100644
--- a/collects/srfi/19/time.rkt
+++ b/collects/srfi/19/time.rkt
@@ -216,33 +216,36 @@
 
 ;; each entry is ( utc seconds since epoch . # seconds to add for tai )
 ;; note they go higher to lower, and end in 1972.
-
-;; added another one for 2006, based on random web-searching.
+;;
+;; up-to-date as of 2013-01-18
 (define tm:leap-second-table
-  '((1136073600 . 33)
-    (915148800  . 32)
-    (867715200  . 31)
-    (820454400  . 30)
-    (773020800  . 29)
-    (741484800  . 28)
-    (709948800  . 27)
-    (662688000  . 26)
-    (631152000  . 25)
-    (567993600  . 24)
-    (489024000  . 23)
-    (425865600  . 22)
-    (394329600  . 21)
-    (362793600  . 20)
-    (315532800  . 19)
-    (283996800  . 18)
-    (252460800  . 17)
-    (220924800  . 16)
-    (189302400  . 15)
-    (157766400  . 14)
-    (126230400  . 13)
-    (94694400   . 12)
-    (78796800   . 11)
-    (63072000   . 10)))
+  '((1341100800 . 35) ; 2012-07-01
+    (1230768000 . 34) ; 2009-01-01
+    (1136073600 . 33) ; 2006-01-01
+    (915148800  . 32) ; 1999-01-01
+    (867715200  . 31) ; 1997-07-01
+    (820454400  . 30) ; 1996-01-01
+    (773020800  . 29) ; 1994-07-01
+    (741484800  . 28) ; 1993-07-01
+    (709948800  . 27) ; 1992-07-01
+    (662688000  . 26) ; 1991-01-01
+    (631152000  . 25) ; 1990-01-01
+    (567993600  . 24) ; 1988-01-01
+    (489024000  . 23) ; 1985-07-01
+    (425865600  . 22) ; 1983-07-01
+    (394329600  . 21) ; 1982-07-01
+    (362793600  . 20) ; 1981-07-01
+    (315532800  . 19) ; 1980-01-01
+    (283996800  . 18) ; 1979-01-01
+    (252460800  . 17) ; 1978-01-01
+    (220924800  . 16) ; 1977-01-01
+    (189302400  . 15) ; 1976-01-01
+    (157766400  . 14) ; 1975-01-01
+    (126230400  . 13) ; 1974-01-01
+    (94694400   . 12) ; 1973-01-01
+    (78796800   . 11) ; 1972-07-01
+    (63072000   . 10) ; 1972-01-01
+    ))
 
 (define (read-leap-second-table filename)
   (set! tm:leap-second-table (tm:read-tai-utc-data filename))
diff --git a/collects/tests/srfi/19/tests.rkt b/collects/tests/srfi/19/tests.rkt
index 9e3f414351..c8b44c38a1 100644
--- a/collects/tests/srfi/19/tests.rkt
+++ b/collects/tests/srfi/19/tests.rkt
@@ -249,6 +249,27 @@
                (check-equal? (srfi:date-year (srfi:make-date 0 0 0 0 1 1 2004 0))
                              2004))
 
+    ;; test leap seconds
+    (test-case "check latest leap seconds"
+               (check-equal?
+                1230768032
+                (time-second (date->time-tai (srfi:make-date 0 59 59 23 31 12 2008 0))))
+               (check-equal?
+                1230768033
+                (time-second (date->time-tai (srfi:make-date 0 60 59 23 31 12 2008 0))))
+               (check-equal?
+                1230768034
+                (time-second (date->time-tai (srfi:make-date 0 0 0 0 1 1 2009 0))))
+               (check-equal?
+                1341100833
+                (time-second (date->time-tai (srfi:make-date 0 59 59 23 30 6 2012 0))))
+               (check-equal?
+                1341100834
+                (time-second (date->time-tai (srfi:make-date 0 60 59 23 30 6 2012 0))))
+               (check-equal?
+                1341100835
+                (time-second (date->time-tai (srfi:make-date 0 0 0 0 1 7 2012 0)))))
+
     ;; nanoseconds off by a factor of 100...
     (test-case "nanosecond order-of-magnitude"
       ;; half a second should be within 1/10th of 10^9 / 2 nanoseconds (currently off by a factor of 100)