Get current quarter in year with javascript

Question

How can I get the current quarter we are in with javascript? I am trying to detect what quarter we are currently in, e.g. 2.

EDIT And how can I coun

Answer 1

// Set Period Function
  SetPeriod(SelectedVal) {
    try {
      if (SelectedVal === '0') { return; }
      if (SelectedVal != null) {
        let yrf: number, mtf: number, dyf: number, yrt: number, mtt: number, dyt: number, dtf: any, dtt: any;
        let dat = new Date();
        let q = 0;
        switch (SelectedVal) {
          case '-1': // Not specify
            frm = ''; to = '';
            return;
          case '0': // As specify
            break;
          case '1': // This Month
            yrf = yrt = dat.getUTCFullYear();
            mtf = mtt = dat.getUTCMonth();
            dyf = 1; dyt = this.getDaysInMonth(mtf, yrf);
            break;
          case '2': // Last Month
            dat.setDate(0); // 0 will result in the last day of the previous month
            dat.setDate(1); // 1 will result in the first day of the month
            yrf = yrt = dat.getUTCFullYear();
            mtf = mtt = dat.getUTCMonth();
            dyf = 1; dyt = this.getDaysInMonth(mtf, yrf);
            break;
          case '3': // This quater
            q = Math.ceil((dat.getUTCMonth()) / 3);
          // tslint:disable-next-line:no-switch-case-fall-through
          case '4': // Last quater
            if (q === 0) { q = Math.ceil(dat.getUTCMonth() / 3) - 1; if (q === 0) { q = 1; } }
            yrf = yrt = dat.getUTCFullYear();
            if (q === 1) {
              mtf = 0; mtt = 2;
              dyf = 1; dyt = 31;
            } else if (q === 2) {
              mtf = 3; mtt = 5;
              dyf = 1; dyt = 30;
            } else if (q === 3) {
              mtf = 6; mtt = 8;
              dyf = 1; dyt = 30;
            } else if (q === 4) {
              mtf = 9; mtt = 11;
              dyf = 1; dyt = 31;
            }
            break;
          case '6': // Last year
            dat = new Date(dat.getUTCFullYear(), 0, 1);
          // tslint:disable-next-line:no-switch-case-fall-through
          case '5': // This year
            yrf = yrt = dat.getUTCFullYear();
            mtf = 0; mtt = 11;
            dyf = 1; dyt = 31;
            break;
        }

        // Convert to new Date
        dtf = new Date(yrf, mtf, dyf);
        dtt = new Date(yrt, mtt, dyt);
        console.log('dtf', dtf);
        console.log('dtt', dtt);

      }
    } catch (e) {
      alert(e);
    }
  }



// Get Day in Month
  getDaysInMonth = (month: number, year: number) => {
    return new Date(year, month + 1, 0).getDate();
  }