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dateObject.getTime()

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<script type="text/javascript">

var d = new Date()
document.write(d.getTime() + " milliseconds since 1970/01/01")

</script>

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<script type="text/javascript">

var minutes = 1000*60
var hours = minutes*60
var days = hours*24
var years = days*365
var d = new Date()
var t = d.getTime()
var y = t/years
document.write("It's been: " + y + " years since 1970/01/01!")

</script>

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TIY

getTime()
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VUE