Height: 6521553
TimeStamp: 56 secs ago (Oct-15-2018 07:55:37 PM +UTC)       <--- here
Transactions: 104 transactions and 23 contract Internal Transactions in this Block
Hash: 0x6995e8a668ddc3743e806e99a3c860b8a57d4a7c8de47664489e0c39749069bb
...

web3.eth.getBlock(blockHashOrBlockNumber [, returnTransactionObjects] [, callback])

web3.eth.getBlock(6521553).then(console.log);

{
    difficulty: "3220937666879710"   ​
    extraData: "0x66726131"  ​
    gasLimit: 8000029  ​
    gasUsed: 7982786
    hash: "0x6995e8a668ddc3743e806e99a3c860b8a57d4a7c8de47664489e0c39749069bb"
    logsBloom: "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"
    miner: "0xb2930B35844a230f00E51431aCAe96Fe543a0347"
    mixHash: "0x31f52f83ea88a0201aa44e3e70abe03d097fbe2fed54d9b32bc268194b0b6ae3"
    nonce: "0x297eb26407ff9ca4"
    number: 6521553
    parentHash: "0x8516a9c81830a6b8d953083af31aad2497f33108d5df184b20098003103e56d8"
    receiptsRoot: "0x4c95c9233bcc119ab84bf347a371229b516aacb13aa55bdbf785dfb635e0a719"
    sha3Uncles: "0x1dcc4de8dec75d7aab85b567b6ccd41ad312451b948a7413f0a142fd40d49347"
    size: 21086
    stateRoot: "0xcfd2357bcdc9497cf7289e45fd142860ecf933becb7b2060f70a1bf00a885ae0"
    timestamp: 1539633337           <--------- here
    totalDifficulty: "7243332583953312312387"
    transactions: Array(104) [...]
    transactionsRoot: "0x1e2248a45cf7e0f3500781a8293eadbaf12235dd5dc78b4f00b87b2559e75c58"
    uncles: Array []
}

Date(1539633337 * 1000)