diff --combined Doc/library/ssl.rst
index a6ce5d6,30cb732..0000000
--- a/Doc/library/ssl.rst
+++ b/Doc/library/ssl.rst
@@@ -366,7 -366,7 +366,7 @@@ Certificate handlin
  
       >>> import ssl
       >>> ssl.cert_time_to_seconds("May  9 00:00:00 2007 GMT")
 -     1178694000.0
 +     1178668800 
       >>> import time
       >>> time.ctime(ssl.cert_time_to_seconds("May  9 00:00:00 2007 GMT"))
       'Wed May  9 00:00:00 2007'
diff --combined Lib/ssl.py
index f81ef91,052a118..0000000
--- a/Lib/ssl.py
+++ b/Lib/ssl.py
@@@ -852,8 -852,7 +852,8 @@@ def cert_time_to_seconds(cert_time)
      a Python time value in seconds past the epoch."""
  
      import time
 -    return time.mktime(time.strptime(cert_time, "%b %d %H:%M:%S %Y GMT"))
 +    import calendar 
 +    return calendar.timegm(time.strptime(cert_time, "%b %d %H:%M:%S %Y GMT"))
  
  PEM_HEADER = "-----BEGIN CERTIFICATE-----"
  PEM_FOOTER = "-----END CERTIFICATE-----"