js 开始时间 结束时间

// 当前时间
let now = new Date();

// 指定日期和时间
let specificDate = new Date('2023-10-01T12:00:00');

function getStartAndEndOfDay(date) {
    let startOfDay = new Date(date.getFullYear(), date.getMonth(), date.getDate());
    let endOfDay = new Date(date.getFullYear(), date.getMonth(), date.getDate() + 1, 0, 0, -1);
    return { startOfDay, endOfDay };
}

let today = new Date();
let { startOfDay, endOfDay } = getStartAndEndOfDay(today);

console.log('Start of Day:', startOfDay.toISOString());
console.log('End of Day:', endOfDay.toISOString());

function isBefore(date1, date2) {
    return date1 < date2;
}

let startDate = new Date('2023-10-01');
let endDate = new Date('2023-10-10');

console.log(isBefore(startDate, endDate)); // 输出: true

let utcDate = new Date().toISOString(); // 获取UTC时间

function formatDate(date) {
    let year = date.getFullYear();
    let month = ('0' + (date.getMonth() + 1)).slice(-2);
    let day = ('0' + date.getDate()).slice(-2);
    return `${year}-${month}-${day}`;
}

console.log(formatDate(new Date())); // 输出类似: 2023-10-05