JavaScript otrzymuje sekundy między dwiema datami
var secondBetweenTwoDate = Math.abs((new Date().getTime() - oldDate.getTime()) / 1000);
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var secondBetweenTwoDate = Math.abs((new Date().getTime() - oldDate.getTime()) / 1000);var t1 = new Date();
var t2 = new Date();
var dif = t1.getTime() - t2.getTime();