`Alan Cox wrote:>>        UTC  equivalent  to  conversion  on  the naive basis that leap seconds are ignored and all>>        years divisible by 4 are leap years.  This value is not the same as the actual  number  of>>        seconds between the time and the Epoch, because of leap seconds and because clocks are not>>        required to be synchronized to a standard reference.>> >> I'm not sure what you are quoting from but it is out of date on the> subject of leap years.> The range of signed 32-bit times is 1901 through 2039, which has onlyone century, 2000, which is a leap year.  So the caveat for leap yearsis correct but unnecessary.So I've discoverd, at least on Ubuntu, something wonderful andreassuring.  It already works exactly the way I think is correct.  Look:I create a test timezone with no daylight saving and one leap second:    davidn@takauji:~/timetest\$ cat tz    Zone testzone 0:00 0 XXX/YYY    davidn@takauji:~/timetest\$ cat leapseconds    Leap 2008 Dec 31 23:59:59 + S    davidn@takauji:~/timetest\$ zic -d . -L leapseconds tzThen the test program, which makes a time_t (what time() returns) for afew seconds before the leap second, then counts off seconds...    davidn@takauji:~/timetest\$ cat timetest.c    #include <time.h>    #include <stdio.h>    main() {            setenv("TZ", ":/home/davidn/timetest/testzone", 1);            struct tm tm1 = { 55, 59, 23, 31, 11, 108 };            time_t t1 = mktime(&tm1);            int i;            for (i = 10; --i; t1++) printf("ctime(%ld) = %s", t1, ctime(&t1));            return 0;          }Observe two 23:59:59's.  Apparently it could be better if the second23:59:59 was 23:59:60, but I prefer it this way.    davidn@takauji:~/timetest\$ ./timetest    ctime(1230767995) = Wed Dec 31 23:59:55 2008    ctime(1230767996) = Wed Dec 31 23:59:56 2008    ctime(1230767997) = Wed Dec 31 23:59:57 2008    ctime(1230767998) = Wed Dec 31 23:59:58 2008    ctime(1230767999) = Wed Dec 31 23:59:59 2008    ctime(1230768000) = Wed Dec 31 23:59:59 2008    ctime(1230768001) = Thu Jan 1 00:00:00 2009    ctime(1230768002) = Thu Jan 1 00:00:01 2009    ctime(1230768003) = Thu Jan 1 00:00:02 2009Perhaps this is distribution-dependent, but even so, there's no need forthe kernel to drop the second (and it's wrong if it does.)`