negative ttl in squid-1.0.15

Hi!

As I can get from squid source, ttl shouldn't be negative

>ttl.c:226
> if (expire > -1) {
> ttl = (expire - squid_curtime);
> if (ttl < 0)
> ttl = 0;
> debug(22, 4, "ttlSet: [%c%c%c%c%c%c%c] %6.2lf days %s\n",
> flags & TTL_EXPIRES ? 'E' : '.',

but when I'm getting http://altavista.digital.com/ (BTW, all my
ttl problems are always concerned with altavista :) what I found
in squid.log:

[17/Sep/1996:19:30:26 +0400] ttl.c:191: ttlSet: Choosing TTL for http://altavis
ta.digital.com/
[17/Sep/1996:19:30:26 +0400] ttl.c:225: ttlSet: Server-Date: Wednesday, 11-Se
p-96 15:39:01 GMT
[17/Sep/1996:19:30:26 +0400] ttl.c:291: ttlSet: [.S....D] -2.99 days http://al
tavista.digital.com/

Any suggestions?

---
                             Alexander Rainchik
                             sysadm://*.icl.kazan.su/