Timestamp of block 253461 wrong?

[ds2013]

How is this possible??

Block	Timestamp
253462	2013-08-21 20:55:38
253461	2013-08-21 21:34:10
253460	2013-08-21 20:44:03

[jackjack]

I know there's a tolerance about timestamps, I don't know how much

Found: it's 2 hours https://en.bitcoin.it/wiki/Block_timestamp

[DannyHamilton]

How is this possible??

It is nearly impossible to keep the clocks of every single node in the bitcoin network perfectly in sync.  Therefore, the protocol allows some tolerance in timestamps.  This variation can result in the timestamp of a block occasionally being earlier than the timestamps on some of the previous blocks.