getUTCMonth() returns the month of the specified date
according to universal time, as a zero-based value (where zero indicates the first month
of the year).
An integer number, between 0 and 11, corresponding to the month of the given date according to universal time. 0 for January, 1 for February, 2 for March, and so on.
The following example assigns the month portion of the current date to the variable
var today = new Date(); var month = today.getUTCMonth();
The definition of 'Date.prototype.getUTCMonth' in that specification.
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