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dateObject.getTimezoneOffset()

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<script type="text/javascript">

var d = new Date()
document.write(d.getTimezoneOffset())

</script>

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<script type="text/javascript">

var d = new Date()
var gmtHours = d.getTimezoneOffset()/60
document.write("The local time zone is: GMT " + gmtHours)

</script>

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