JavaScript method to return the number of milliseconds from January 1, 1970 to a specified date based on Universal Time UTC()

Definition and Usage

The UTC() method returns the number of milliseconds from January 1, 1970 to the specified date based on universal time.

Syntax

Date.UTC(year,month,day,hours,minutes,seconds,ms)

Parameters	Description
year	Required. A four-digit number representing the year.
month	Required. Integer representing the month, ranging from 0 ~ 11.
day	Required. An integer representing the date, ranging from 1 to 31.
hours	Optional. An integer representing the hour, between 0 and 23.
minutes	Optional. An integer representing minutes, ranging from 0 to 59.
seconds	Optional. An integer representing seconds, ranging from 0 to 59.
ms	Optional. An integer representing milliseconds, ranging from 0 to 999.

Return Value

Returns the number of milliseconds from the specified time to midnight GMT on January 1, 1970.

Explanation

Date.UTC() is a static method because it needs to be called using the constructor Date() instead of Called through a Date object.

The parameters of the Date.UTC() method specify the date and time, which are both UTC times and are in the GMT time zone. The specified UTC time is converted to milliseconds so that it can be used by the Date() constructor and the Date.setTime() method.

Example

Example 1

In this example, we will get the number of milliseconds from 1970/01/01 to 2005/07/08 based on universal time:

<script type="text/javascript">

var d = Date.UTC(2005,7,8)
document.write(d)

</script>

Output:

1123459200000

Example 2

Now, we will transform the above example so that the output is converted to years:

<script type="text/javascript">

var minutes = 1000 * 60
var hours = minutes * 60
var days = hours * 24
var years = days * 365
var t = Date.UTC(2005,7,8)
var y = t/years
document.write("It&#39;s been: " + y + " years from 1970/01/01")
document.write(" to 2005/07/08!")

</script>

Output:

It's been: 35.62465753424657 years from 1970/01/01 to 2005/07/08!

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