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Short & Snazzy:
+ new Date()
A unary operator like plus triggers the valueOf method in the Date object and it returns the timestamp (without any alteration).
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var currentTimeInSeconds=Math.floor(Date.now()/1000); //unix timestamp in seconds
var currentTimeInMilliseconds=Date.now(); // unix timestamp in milliseconds
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const currentTimeInMilliseconds=Date.now(); // unix timestamp in milliseconds
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var timestamp = new Date().getTime();
console.log(timestamp);
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// Get current timestamp in milliseconds
const timestamp = Date.now();
console.log(timestamp);