Date-时间相关

getTime 获取某个时间的时间戳-例：new Date()    new Date('2001/10/01 08:08:08')

new Date('2001/10/1 08:08:08')传入接口输出2001-10-01T00:08:08.000Z
new Date('2001/10/1 08:08:08')控制台输出Mon Oct 01 2001 08:08:08 GMT+0800 (中国标准时间)
还需要手动处理转为yyyy-MM-dd HH:mm:ss
getYMDHMS = (timestamp = new Date('1970/01/01 00:00:00').getTime()) => {
    let time = new Date(timestamp)
    let year = time.getFullYear()
    const month = (time.getMonth() + 1).toString().padStart(2, '0')
    const date = (time.getDate()).toString().padStart(2, '0')
    const hours = (time.getHours()).toString().padStart(2, '0')
    const minute = (time.getMinutes()).toString().padStart(2, '0')
    const second = (time.getSeconds()).toString().padStart(2, '0')
    return year + '-' + month + '-' + date + ' ' + hours + ':' + minute + ':' + second
}

console.log(getYMDHMS())格式
convert = (date = new Date(), format = 'yyyy-MM-dd hh:mm:ss') => {
    let _this = date
    if (!date) {
        return "";
    }
    var args = {
        "M+": _this.getMonth() + 1,
        "d+": _this.getDate(),
        "h+": _this.getHours(),
        "m+": _this.getMinutes(),
        "s+": _this.getSeconds(),
        "q+": Math.floor((_this.getMonth() + 3) / 3), //quarter
        "S": _this.getMilliseconds()
    };
    if (/(y+)/.test(format))
        format = format.replace(RegExp.$1, (_this.getFullYear() + "").substr(4 - RegExp.$1.length));
    for (var i in args) {
        var n = args[i];
        if (new RegExp("(" + i + ")").test(format))
            format = format.replace(RegExp.$1, RegExp.$1.length === 1 ? n : ("00" + n).substr(("" + n).length));
    }
    return format;
};

console.log(convert())

时间戳转yyyy-MM-dd HH:mm:ss
getTime 获取某个时间的时间戳-例：new Date()    new Date('2001/10/01 08:08:08')
getYMDHMS = (timestamp = new Date('1970/01/01 00:00:00').getTime()) => {
    let time = new Date(timestamp)
    let year = time.getFullYear()
    const month = (time.getMonth() + 1).toString().padStart(2, '0')
    const date = (time.getDate()).toString().padStart(2, '0')
    const hours = (time.getHours()).toString().padStart(2, '0')
    const minute = (time.getMinutes()).toString().padStart(2, '0')
    const second = (time.getSeconds()).toString().padStart(2, '0')
    return year + '-' + month + '-' + date + ' ' + hours + ':' + minute + ':' + second
}
console.log(getYMDHMS())

一年有几天
const allDays = (year) => {
    let leapYear = false, sum_day = 0, month_arr = [4, 6, 9, 11];
    if (year % 100 === 0) { // 年份是整百
        leapYear = year % 400 === 0
    } else {
        leapYear = year % 4 === 0
    }
    // 下面计算每个月的天数
    for (let i = 1; i < 13; i++) {
        if (i === 2) {
            sum_day += leapYear ? 29 : 28
        } else if (month_arr.includes(i)) {
            sum_day += 30
        } else {
            sum_day += 31
        }
    }
    return sum_day
}

console.log(allDays(2005))

待补充........................... 倒计时：服务端返回截至时间-根据当前时间做递减