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?

This is meant for debugging purposes only and will very likely be removed soon.

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