d2/src/period/generators/bi-monthly.js

Javascript library for DHIS2

import {
    validateIfValueIsInteger,
    formatAsISODate,
    getCurrentYear,
    addMonths,
    getBiMonthlyId,
} from '../helpers'

export function generateBiMonthlyPeriodsForYear(
    year = getCurrentYear(),
    locale = 'en'
) {
    validateIfValueIsInteger(year)

    const periods = []
    const date = new Date(`31 Dec ${year}`)

    while (date.getFullYear() === year) {
        const period = {}
        period.endDate = formatAsISODate(date)
        date.setDate(0)
        date.setDate(1)

        const firstMonth = date.toLocaleDateString(locale, { month: 'long' })
        const lastMonth = addMonths(1, date).toLocaleDateString(locale, {
            month: 'long',
        })

        period.startDate = formatAsISODate(date)
        period.name = `${firstMonth} - ${lastMonth} ${date.getFullYear()}`
        period.id = getBiMonthlyId(date)
        periods.push(period)
        date.setDate(0)
    }

    // Bi-months are collected backwards. So we reverse to get the chronological order.
    return periods.reverse()
}