2.1.114 [ECMA-262-1999] Section 188.8.131.52, Date.prototype.setUTCSeconds (sec [, ms ] )
If ms is not specified, this function behaves as if ms were specified with the value getUTCMilliseconds( ).
(The bulleted step is added before step 1)
If the argument sec is not present, throw a TypeError exception.
Let t be this time value.
If ms is not specified, compute msFromTime(t); otherwise, call ToNumber(ms).
Compute MakeTime(HourFromTime(t), MinFromTime(t), Result(2), Result(3)).
Compute MakeDate(Day(t), Result(4)).
Set the [[Value]] property of the this value to TimeClip(Result(5)).
Return the value of the [[Value]] property of the this value.
The length property of the setUTCSeconds method is 2.