String.prototype.trim = function() {
    return this.replace( /^\s+|\s+$/, "" );
}

Date.prototype.setISO8601 = function(dString){
    var regexp = /(\d\d\d\d)(-)?(\d\d)(-)?(\d\d)(T)?(\d\d)(:)?(\d\d)(:)?(\d\d)(\.\d+)?(Z|([+-])(\d\d)(:)?(\d\d))/;
    if (dString.toString().match(new RegExp(regexp))) {
        var d = dString.match(new RegExp(regexp));
        var offset = 0;

        this.setUTCDate(1);
        this.setUTCFullYear(parseInt(d[1],10));
        this.setUTCMonth(parseInt(d[3],10) - 1);
        this.setUTCDate(parseInt(d[5],10));
        this.setUTCHours(parseInt(d[7],10));
        this.setUTCMinutes(parseInt(d[9],10));
        this.setUTCSeconds(parseInt(d[11],10));
        if (d[12])
            this.setUTCMilliseconds(parseFloat(d[12]) * 1000);
        else
            this.setUTCMilliseconds(0);
        if (d[13] != 'Z') {
            offset = (d[15] * 60) + parseInt(d[17],10);
            offset *= ((d[14] == '-') ? -1 : 1);
            this.setTime(this.getTime() - offset * 60 * 1000);
        }
    } else {
        this.setTime(Date.parse(dString));
    }
    return this;
};

Date.prototype.setYYYYMMDD = function(dString) {
    var regexp = /(\d\d\d\d)(-)?(\d\d)(-)?(\d\d)/;
    if (dString.toString().match(new RegExp(regexp))) {
        var d = dString.match(new RegExp(regexp));

        this.setUTCDate(1);
        this.setUTCFullYear(parseInt(d[1],10));
        this.setUTCMonth(parseInt(d[3],10) - 1);
        this.setUTCDate(parseInt(d[5],10));
        this.setUTCHours(0);
        this.setUTCMinutes(0);
        this.setUTCSeconds(0);
    } else {
        this.setTime(Date.parse(dString));
    }
    return this;
}