date-holidays-parser/src/Jalaali.js

parser for worldwide holidays

import CalDate from 'caldate'
import CalEvent from './CalEvent.js'
import jalaali from 'jalaali-js'

const { toJalaali, toGregorian } = jalaali

export default class Jalaali extends CalEvent {
  /**
   * @param {number} year gregorian year
   * @returns
   */
  inYear (year) {
    const nowruz = toJalaali(year, 1, 1)

    if (this.opts.year && nowruz.jy !== this.opts.year) {
      return this
    }
    const { gy, gm, gd } = toGregorian(this.opts.year || nowruz.jy, this.opts.month, this.opts.day)

    const d = (new CalDate({ year: gy, month: gm, day: gd })).setOffset(this.offset)
    this.dates.push(d)
    return this
  }
}