js short snippet related date

date.ts

function getDateString(inputDate: Date) {
    const date = inputDate;
    return `${date.getFullYear()}-${date.getMonth()+1}-${date.getDate()}`;
}

function getCurrentDate() {
    const date = new Date();
    return `${date.getFullYear()}-${date.getMonth()+1}-${date.getDate()}`;
}

function getCurrentDateGap(day: number) {
    const date = new Date(new Date().getTime() - day * 86400000);
    return `${date.getFullYear()}-${date.getMonth()+1}-${date.getDate()}`;
}

function getWeekFirstDay(inputDate: Date) {
    const day = inputDate.getDay();
    const dayUnit = 1000 * 60 * 60 * 24;

    return new Date(inputDate.getTime() - dayUnit * day);
}

function getWeekLastDay(inputDate: Date) {
    const day = inputDate.getDay();
    const dayUnit = 1000 * 60 * 60 * 24;

    return new Date(inputDate.getTime() + dayUnit * (6 - day));
}

function getMonthFirstDay(inputDate: Date) {
    const year = inputDate.getFullYear();
    const month = inputDate.getMonth();

    return new Date(year, month, 1);
}

function getMonthLastDay(inputDate: Date) {
    const year = inputDate.getFullYear();
    const month = inputDate.getMonth();

    return new Date(year, month + 1, 0);
}

function getYearFirstDay(inputDate: Date) {
    const year = inputDate.getFullYear();

    return new Date(year, 1, 1);
}

function getYearLastDay(inputDate: Date) {
    const year = inputDate.getFullYear();

    return new Date(year, 1, 0);
}