How to interpret memcached cachedump?

I added an entry to memcached and looking at the cachedump.

set a 0 0 5
hello
STORED

stats cachedump 1 5
ITEM a [5 b; 1312548967 s]
END

The first value 5 b is size of the item which is 5 bytes. The second one is what I'm confused about. It looks like time since epoch.

I tried adding another entry and even that entry got exactly same value.

set b 0 0 5
hello
STORED

stats cachedump 1 5
ITEM b [5 b; 1312548967 s]
ITE开发者_运维知识库M a [5 b; 1312548967 s]
END

It looks like some kind of time, but I'm not sure what it really is. Can some one explain it?

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