SHDate.getMilliseconds()
The getMilliseconds() method returns the milliseconds in the specified date according to local time.
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Syntax
getMilliseconds();
Return value
A number, between 0 and 999, representing the milliseconds for the given date according to local time.
Examples
Using getMilliseconds() The following example assigns the milliseconds portion of the current time to the variable milliseconds:
var today = new SHDate();
var milliseconds = today.getMilliseconds();
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date/getMilliseconds