d2/src/period/formatters.js

Javascript library for DHIS2

// For 'en': January 1, 2017
// For 'nl': 1 januari 2017
// For 'zh': 2017年1月1日
const localeDayFormatOptions = {
    year: 'numeric',
    month: 'long',
    day: 'numeric',
}

const getFormatterMemoized = (() => {
    const formatters = new Map()

    return (locale, options) => {
        if (formatters.has(locale) && formatters.get(locale).has(options)) {
            return formatters.get(locale).get(options)
        }
        const formatter = new Intl.DateTimeFormat(locale, options)

        formatters.set(locale, new Map([[options, formatter]]))

        return formatter
    }
})()

export function toLocaleDayFormat(date, locale = 'en') {
    return getFormatterMemoized(locale, localeDayFormatOptions).format(date)
}