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For example, I'm forever looking up how to display unix time stamp in human readable format in MySQL.

SELECT
  FROM_UNIXTIME(timestamp) 
FROM 
  my_table;

FROM_UNIXTIME MySQL documentation

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PHP

• time() Return current Unix timestamp UTC
• date() Display human readable time from Unix timestamp

JavaScript

Get current Unix timestamp

var unixTimestamp = Math.round(new Date().getTime() / 1000);