Chunk for creating calendar with moment js and react

calendarChunkWithMoment.js

updateDates = () => {
  const date = this.state.currentDate.startOf('month')
  const delta = Math.abs(1-date.day())
  let daysInMonth = date.daysInMonth() + delta
  date.subtract(delta+1, 'd')
  const arrayOfDays = []
  while(daysInMonth > 0){
    let dateNew = Moment(date.add(1, 'd'))      
    arrayOfDays.push(dateNew)
    daysInMonth-=1
  }
  this.setState({ calendar: arrayOfDays })

}