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Handle multi-day holidays.

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Some countries (e.g. Russia, or Vietnam) have holidays which span several
days. Rather than using `holiday.date` from the date-holidays library, we
can check the `.start` (inclusive) and `.end` (exclusive) dates, and use
these to show multiple holiday days on the calendar.

However since these properties return a `Date` representing the start of
the day in that country, rather than an ISO string like `.date` does, we
also need to pass in the current browser `timezone` to the library, so
that we show the correct dates to the user.
This commit is contained in:
Christopher Orr
2024-11-15 10:10:11 +01:00
parent 7ac4e085eb
commit 3d89eb8582
1 changed files with 9 additions and 5 deletions
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14
src/lib/holidayUtils.ts
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@@ -33,14 +33,18 @@ export function getHolidaysForYear(countryCode: string, year: number, stateCode?
// The date-holidays lib has translations for many holidays, but defaults to using the language of the country. // The date-holidays lib has translations for many holidays, but defaults to using the language of the country.
// We can pass in the browser's preferred languages (though the lib doesn't fall back, e.g. from `de-AT` to `de`) // We can pass in the browser's preferred languages (though the lib doesn't fall back, e.g. from `de-AT` to `de`)
const languages = navigator.languages.map(lang => lang.split('-')[0]); const languages = navigator.languages.map(lang => lang.split('-')[0]);
const opts = { languages } // Start/end dates are returned in that country/state's time zone, so we need to provide our time zone to localise
const opts = { languages, timezone: Intl.DateTimeFormat().resolvedOptions().timeZone };
const hd = stateCode ? new Holidays(countryCode, stateCode, opts) : new Holidays(countryCode, opts); const hd = stateCode ? new Holidays(countryCode, stateCode, opts) : new Holidays(countryCode, opts);
return hd.getHolidays(year) return hd.getHolidays(year)
.filter(holiday => holiday.type === 'public') .filter(holiday => holiday.type === 'public')
.map(holiday => ({ .flatMap(holiday =>
date: new Date(holiday.date), // To handle single- and multi-day holidays, we generate a holiday entry for each day in the period
name: holiday.name Array.from({ length: daysBetween(holiday.start, holiday.end) }, (_, i) => ({
})); date: new Date(holiday.start.getFullYear(), holiday.start.getMonth(), holiday.start.getDate() + i),
name: holiday.name,
}))
);
} }
// Optimize days off to create the longest possible chains // Optimize days off to create the longest possible chains