generateHeadings(): AsyncSubject<CalendarHeading[]> {

        let subjectGenerateHeadings = new AsyncSubject<CalendarHeading[]>();

        /* Calculate month headings */
        let i;
        let currentMonth = this.month;

        // 3 Headings : 93 days

        for (i = 0; i < 3; i++) {

            let heading: CalendarHeading = {
                clickViewType: this.viewType = 'q',
                title: this.getMonthName(currentMonth),
            }

            currentMonth++;
            this.calendarHeadings.push(heading);
            // console.log(this.monthlyHeadings);
        }

        /* Calculate week headings */

        let weekCount = this.weekCount(this.year, this.month);

        this.weekNo = SabreCommon.getISOWeekNumber();

        for (i = 0; i < this.weekCount(this.year, this.month); i++) {

            //    1 heading : 4-5 Weeks
            var mthHeading: CalendarHeading = {
                clickViewType: this.viewType = 'm',
                weekNumber: this.weekNo,
                daysInMonth: this.monthLength,
                numberOfWeeks: this.weekCount(this.year, this.month),
            }

            this.weekNo++
            this.calendarHeadings.push(mthHeading);
            // console.log(this.weeklyHeadings);
        }


        /* Calculate week days */

        let daysOfWeek = ['Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday', 'Sunday'];

        for (i = 1; i < 7; i++) {

            let wklHeading: CalendarHeading = {
                dayOfWeek: this.dayName,
                clickViewType: this.viewType = 'w'
            }

            switch (this.day) {
                case 0:
                    this.dayName = 'Monday';
                    break;
                case 1:
                    this.dayName = 'Tuesday';
                    break;
                case 2:
                    this.dayName = 'Wednesday';
                    break;
                case 3:
                    this.dayName = 'Thursday';
                    break;
                case 4:
                    this.dayName = 'Friday';
                    break;
                case 5:
                    this.dayName = 'Saturday';
                case 6:
                    this.dayName = 'Sunday';
                    break;
            }
            this.day++;
            this.calendarHeadings.push(wklHeading);
            // console.log(this.dailyHeadings);
        }

        // this.calendarHeadings.map(x => {
        //     switch (x.clickViewType) {
        //         case 'q':
        //             this.calendarHeadings = this.monthlyHeadings;
        //             break;
        //         case 'm':
        //             this.calendarHeadings = this.weeklyHeadings;
        //         case 'w':
        //             this.calendarHeadings = this.dailyHeadings;
        //      }

        // })

        subjectGenerateHeadings.next(this.calendarHeadings);
        console.log(this.calendarHeadings);
        subjectGenerateHeadings.complete;

        return subjectGenerateHeadings;

    }