Method diff

src/index.js:350–389

(input, units, float)

  }

  diff(input, units, float) {
    const unit = Utils.p(units)
    const that = dayjs(input)
    const zoneDelta = (that.utcOffset() - this.utcOffset()) * C.MILLISECONDS_A_MINUTE
    const diff = this - that
    const getMonth = () => Utils.m(this, that)

    let result
    switch (unit) {
      case C.Y:
        result = getMonth() / 12
        break
      case C.M:
        result = getMonth()
        break
      case C.Q:
        result = getMonth() / 3
        break
      case C.W:
        result = (diff - zoneDelta) / C.MILLISECONDS_A_WEEK
        break
      case C.D:
        result = (diff - zoneDelta) / C.MILLISECONDS_A_DAY
        break
      case C.H:
        result = diff / C.MILLISECONDS_A_HOUR
        break
      case C.MIN:
        result = diff / C.MILLISECONDS_A_MINUTE
        break
      case C.S:
        result = diff / C.MILLISECONDS_A_SECOND
        break
      default:
        result = diff // milliseconds
        break
    }

    return float ? result : Utils.a(result)
  }

  daysInMonth() {
    return this.endOf(C.M).$D