Today I found memcached cat not be work。 so , I found memcached stats time 
while being changed before os date change。

*EXP-1 :*
Centos 6.5 64bit 
Memcache Version: 1.4.7 

# date
Tue Sep 16 09:56:43 CST 2014

# telnet 10.11.1.15 11211
Trying 10.11.1.15...
Connected to 10.11.1.15 (10.11.1.15).
Escape character is '^]'. stats
STAT pid 2923
STAT uptime 9
STAT time 1410850931
STAT version 1.4.7

*change date *
# date
Fri Jul 26 00:00:00 CST 2013

# telnet 10.11.1.15 11211
Trying 10.11.1.15...
Connected to 10.11.1.15 (10.11.1.15).
Escape character is '^]'. stats
stats
STAT pid 2923
STAT uptime 4258884380
STAT time 5669735302
STAT version 1.4.7

*however upgrade memcache to 1.4.20 *
Centos 6.5 64bit 
Memcache Version: 1.4.20

#stats
STAT pid 2586
STAT uptime 8
STAT time 1410838280
STAT version 1.4.20
STAT libevent 1.4.13-stable

*change date *
stats
STAT pid 2586
STAT uptime 55
STAT time 1410838327
STAT version 1.4.20

Now, this time can not be changed. what's the matter ? 

I did not find the answer 
in http://code.google.com/p/memcached/wiki/ReleaseNotes 。 

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