Javascript 日期转换 几天前

时间函数

function formatDt(date) {
// ReSharper disable once IdentifierTypo
    var yare = date.getYear() + 1900;
    var month = date.getMonth() + 1;
    var day = date.getDate();
    var hour = date.getHours();
    var minutes = date.getMinutes();
    var second = date.getSeconds();

    month = month.toString().padStart(2,'0');
    day = day.toString().padStart(2,'0');
    hour = hour.toString().padStart(2,'0');
    minutes = minutes.toString().padStart(2,'0');
    second = second.toString().padStart(2,'0');

    return `${yare}-${month}-${day} ${hour}:${minutes}:${second}`;
}

将几天前  转换为当前时间

var dtReg = /d{4}年d{2}月d{2}日 d{2}:d{2}/
var minReg = /d+(?=分钟前)/
var houReg = /d+(?=小时前)/
var dayReg = /d+(?=天前)/


function dtToString(date) {
    var yare = date.getYear() + 1900
    var month = date.getMonth() + 1
    var day = date.getDate()
    var hour = date.getHours()
    var minutes = date.getMinutes()
    var second = date.getSeconds()
    return `${yare}-${month}-${day} ${hour}:${minutes}:${second}`
}

if (dtReg.test(input)) {
    input = input.replace('年', '-')
    input = input.replace('月', '-')
    input = input.replace('日', '')
    input = input+':00'
} else if (minReg.test(input)) {
    var now = new Date()
    var count = Number(minReg.exec(input))
    var dt = now - count * 60 * 1000
    input = formatDt(new Date(dt))
} else if (houReg.test(input)) {
    var now = new Date()
    var count = Number(houReg.exec(input))
    var dt = now - count * 60  * 60 * 1000
    input = formatDt(new Date(dt))
}
 else if (dayReg.test(input)) {
    var now = new Date()
    var count = Number(dayReg.exec(input))
    var dt = now - count * 60  * 60 * 24 * 1000
    input = formatDt(new Date(dt))
}