@kahi-ui/framework/util/datetime/calendars.js

Straight-forward Svelte UI for the Web

import { chunk, fill } from "../functional";
import { wrap } from "../math";
import { from_datestamp, to_datestamp } from "./datestamps";
function get_calendar_day(date) {
    return wrap(date.dayOfWeek + 1, 1, date.daysInWeek);
}
export function get_month_quaters(datestamp) {
    const source_date = from_datestamp(datestamp);
    const year_date = source_date.with({ day: 1, month: 1 });
    const months = fill((index) => {
        if (index === source_date.month - 1)
            return source_date;
        return year_date.add({ months: index });
    }, year_date.monthsInYear).map((target_date, index) => to_datestamp(target_date));
    return chunk(months, year_date.monthsInYear / 4);
}
export function get_year_halves(datestamp) {
    const source_date = from_datestamp(datestamp);
    const year_date = source_date.with({
        day: 1,
        month: 1,
        year: Math.floor(source_date.year / 10) * 10,
    });
    const years = fill((index) => {
        const target_date = year_date.add({ years: index });
        return source_date.year === target_date.year ? source_date : target_date;
    }, 10).map((target_date, index) => to_datestamp(target_date));
    return chunk(years, 5);
}
export function get_week_days(datestamp) {
    const source_date = from_datestamp(datestamp, { day: 1 });
    const starting_date = source_date.subtract({
        days: get_calendar_day(source_date) - 1,
    });
    let ending_date = source_date.with({ day: source_date.daysInMonth });
    ending_date = ending_date.add({
        days: ending_date.daysInWeek - get_calendar_day(ending_date) + 1,
    });
    const duration = starting_date.until(ending_date).total({ unit: "day" });
    const days = fill((index) => starting_date.add({ days: index }), duration).map((target_date, index) => to_datestamp(target_date));
    return chunk(days, source_date.daysInWeek);
}