In Moment.js, how do you get the current financial Quarter?

This is now supported in moment:

moment('2014-12-01').utc().quarter() //outputs 4
moment().quarter(); //outputs current quarter ie. 2

Documentation

Using version 2.14.1+ you can do something like the following:

moment().quarter() returns the current quarter number: 1, 2, 3, 4.

moment().quarter(moment().quarter()).startOf('quarter');

Would return the current quarter with the date set to the quarter starting date.

moment().quarter(moment().quarter()).startOf('quarter');

Would return the current quarter with the date set to quarter ending date.

You could also define a function that takes the corresponding quarter number as argument (1,2,3,4), and returns an object containing the start and end date of the quarter.

function getQuarterRange(quarter) {

  const start = moment().quarter(quarter).startOf('quarter');

  const end = moment().quarter(quarter).endOf('quarter');

  return {start, end};
}