一、时间格式化 【YYYY-MM-DD hh:mm:ss】

function formatDate(cellValue) {
  if (cellValue == null || cellValue == "") return "";
  var date = new Date(cellValue) 
  var year = date.getFullYear()
  var month = date.getMonth() + 1 < 10 ? '0' + (date.getMonth() + 1) : date.getMonth() + 1
  var day = date.getDate() < 10 ? '0' + date.getDate() : date.getDate() 
  var hours = date.getHours() < 10 ? '0' + date.getHours() : date.getHours() 
  var minutes = date.getMinutes() < 10 ? '0' + date.getMinutes() : date.getMinutes() 
  var seconds = date.getSeconds() < 10 ? '0' + date.getSeconds() : date.getSeconds()
  return year + '-' + month + '-' + day + ' ' + hours + ':' + minutes + ':' + seconds
}

二、指定日期时间格式化 （默认为{y}-{m}-{d} {h}:{i}:{s}，也可以自己指定格式）

<script>
    function parseTime(time, pattern) {
    //判断是否有传入日期
        if (arguments.length === 0 || !time) {
            return null
        }
        //指定输出的日期时间格式，默认为'{y}-{m}-{d} {h}:{i}:{s}'
        const format = pattern || '{y}-{m}-{d} {h}:{i}:{s}'
        let date
        if (typeof time === 'object') {
            date = time
        } else {
            if ((typeof time === 'string') && (/^[0-9]+$/.test(time))) {
                time = parseInt(time)
            } else if (typeof time === 'string') {
                time = time.replace(new RegExp(/-/gm), '/').replace('T', ' ').replace(new RegExp(/\.[\d]{3}/gm), '');
            }
            if ((typeof time === 'number') && (time.toString().length === 10)) {
                time = time * 1000
            }
            date = new Date(time)
        }
        const formatObj = {
            y: date.getFullYear(),
            m: date.getMonth() + 1,
            d: date.getDate(),
            h: date.getHours(),
            i: date.getMinutes(),
            s: date.getSeconds(),
            a: date.getDay()
        }
        const time_str = format.replace(/{(y|m|d|h|i|s|a)+}/g, (result, key) => {
            let value = formatObj[key]
            // Note: getDay() returns 0 on Sunday
            if (key === 'a') { return ['日', '一', '二', '三', '四', '五', '六'][value] }
            if (result.length > 0 && value < 10) {
                value = '0' + value
            }
            return value || 0
        })
        return time_str
    }
    console.log(parseTime(new Date(),'{y}:{m}:{d}'));//2023:09:19
</script>
/**
     * @param {number} time
     * @param {string} option
     * @returns {string}
     */
    function formatTime(time, option) {

        if (('' + time).length === 10) {
            time = parseInt(time) * 1000
        } else {
            time = +time
        }
        const d = new Date(time)
        const now = Date.now()

        const diff = (now - d) / 1000

        if (diff < 30) {
            return '刚刚'
        } else if (diff < 3600) {
            // less 1 hour
            return Math.ceil(diff / 60) + '分钟前'
        } else if (diff < 3600 * 24) {
            return Math.ceil(diff / 3600) + '小时前'
        } else if (diff < 3600 * 24 * 2) {
            return '1天前'
        }
        if (option) {
            return parseTime(time, option)
        } else {
            return (
                d.getMonth() +
                1 +
                '月' +
                d.getDate() +
                '日' +
                d.getHours() +
                '时' +
                d.getMinutes() +
                '分'
            )
        }
    }

三、计算剩余时间

以分钟为单位、不超过两周

// 剩余时间
function computingTime(minute) {
	if (minute < 60) {
		minute = +"分钟"
	} else {
		if (minute >= 60 && minute < 1440) {
			minute = parseInt(minute / 60) + "小时"
		} else {
			minute = parseInt(minute / 60 / 24) + "天"
		}
	}
	return minute
}