Date.now() - JavaScript | MDN
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date/now
To offer protection against timing attacks and fingerprinting, the precision of Date.now() might get rounded depending on browser settings. In Firefox, the privacy.reduceTimerPrecision preference is enabled by default and defaults to 20µs in Firefox 59; in 60 it will be 2ms. // reduced time precision (2ms) in Firefox 60 Date. now // 1519211809934 // 1519211810362 // 1519211811670 ...
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