js格式转换

1、中国标准时间转换为正常格式：

转换之前如下图：

代码：

	 let date = this.start_timestamp; let date_value = date.getFullYear() + '-' + (date.getMonth() + 1) + '-' + date.getDate() + ' ' + date.getHours() + ':' + date.getMinutes() + ':' + date.getSeconds();

转换后结果为：

将时间转换为时间戳 ：

let millisecond = Date.parse(date_value);

2.前端从mysql取出timestamp类型的时间与实际时间差8小时问题，以及时间格式化解决：

引入文件 DateUtils.js

// 当前日期
let now = new Date();
// 今天本周的第几天
let nowDayOfWeek = now.getDay();
// 当前日
let nowDay = now.getDate();
// 当前月
let nowMonth = now.getMonth();
// 当前年
let nowYear = now.getYear();
nowYear += (nowYear < 2000) ? 1900 : 0;class DateUtils {static parseLongDate (dateStr) {return Date.parse(dateStr.replace(/-/g, '/'));}// 格式化日期：yyyy-MM-ddstatic formatDate (date) {let myyear = date.getFullYear();let mymonth = date.getMonth() + 1;let myweekday = date.getDate();if (mymonth < 10) {mymonth = '0' + mymonth;}if (myweekday < 10) {myweekday = '0' + myweekday;}return (myyear + '-' + mymonth + '-' + myweekday);}// 格式化日期：yyyy-MM-ddstatic formatLongDate (date) {let myyear = date.getFullYear();let mymonth = date.getMonth() + 1;let myweekday = date.getDate();let myHour = date.getHours();let myMin = date.getMinutes();let mySec = date.getSeconds();if (mymonth < 10) {mymonth = '0' + mymonth;}if (myweekday < 10) {myweekday = '0' + myweekday;}if (myHour < 10) {myHour = '0' + myHour;}if (myMin < 10) {myMin = '0' + myMin;}if (mySec < 10) {mySec = '0' + mySec;}return (myyear + '-' + mymonth + '-' + myweekday + ' ' + myHour + ':' + myMin + ':' + mySec);}// 获得某月的天数static getMonthDays (myMonth) {let monthStartDate = new Date(nowYear, myMonth, 1);let monthEndDate = new Date(nowYear, myMonth + 1, 1);let days = (monthEndDate - monthStartDate) / (1000 * 60 * 60 * 24);return days;}// 获得本季度的开始月份static getQuarterStartMonth () {let quarterStartMonth = 0;if (nowMonth < 3) {quarterStartMonth = 0;}if (nowMonth > 2 && nowMonth < 6) {quarterStartMonth = 3;}if (nowMonth > 5 && nowMonth < 9) {quarterStartMonth = 6;}if (nowMonth > 8) {quarterStartMonth = 9;}return quarterStartMonth;}// 获得本周的开始日期static getWeekStartDate () {let weekStartDate = new Date(nowYear, nowMonth, nowDay - nowDayOfWeek);return this.formatDate(weekStartDate);}// 获得本周的结束日期static getWeekEndDate () {let weekEndDate = new Date(nowYear, nowMonth, nowDay + (6 - nowDayOfWeek));return this.formatDate(weekEndDate);}// 获得本月的开始日期static getMonthStartDate () {let monthStartDate = new Date(nowYear, nowMonth, 1);return this.formatDate(monthStartDate);}// 获得本月的结束日期static getMonthEndDate () {let monthEndDate = new Date(nowYear, nowMonth, this.getMonthDays(nowMonth));return this.formatDate(monthEndDate);}// 获得本季度的开始日期static getQuarterStartDate () {let quarterStartDate = new Date(nowYear, this.getQuarterStartMonth(), 1);return this.formatDate(quarterStartDate);}// 或的本季度的结束日期static getQuarterEndDate () {let quarterEndMonth = this.getQuarterStartMonth() + 2;let quarterStartDate = new Date(nowYear, quarterEndMonth, this.getMonthDays(quarterEndMonth));return this.formatDate(quarterStartDate);}static getDateWeek (date) {let week = ['周日', '周一', '周二', '周三', '周四', '周五', '周六'];return week[date.getDay()];}static utc2beijing(utc_datetime) {// 转为正常的时间格式 年-月-日 时:分:秒let T_pos = utc_datetime.indexOf('T');let Z_pos = utc_datetime.indexOf('Z');let year_month_day = utc_datetime.substr(0,T_pos);let hour_minute_second = utc_datetime.substr(T_pos+1,Z_pos-T_pos-1);let new_datetime = year_month_day+" "+hour_minute_second; // 2017-03-31 08:02:06// 处理成为时间戳timestamp = new Date(Date.parse(new_datetime));timestamp = timestamp.getTime();timestamp = timestamp/1000;// 增加8个小时，北京时间比utc时间多八个时区let timestamp = timestamp+8*60*60;// 时间戳转为时间let date = new Date(parseInt(timestamp) * 1000);//let beijing_datetime =date.getFullYear() + '-' + (date.getMonth() + 1) + '-' + date.getDate() + ' ' + date.getHours() + ':' + date.getMinutes() + ':' + date.getSeconds();var y = date.getFullYear();var m = date.getMonth() + 1;m = m < 10 ? ('0' + m) : m;var d = date.getDate();d = d < 10 ? ('0' + d) : d;var h = date.getHours();h = h < 10 ? ('0' + h) : h;var minute = date.getMinutes();var second = date.getSeconds();minute = minute < 10 ? ('0' + minute) : minute;second = second < 10 ? ('0' + second) : second;let beijing_datetime= y + '-' + m + '-' +d+' '+h+':'+minute+':'+second;return beijing_datetime; // 2017-03-31 16:02:06}}
export default DateUtils;

在需要转换时间的页面引入：

import DateUtils from '../../utils/DateUtils'

调用：

var testTime = DateUtils.utc2beijing(testTime );