Vue.js----date与时间戳的转换（unixTime）Moment.js让日期处理变得更简单

当前日期格式化

let curTime = moment().format('YYYY-MM-DD HH:mm:ss')
console.log('当前日期时间curTime:' + curTime)//curTime:2019-01-30 10:21:11

指定日期格式化

let a = '20190130'
let aFormat = moment(a).format('YYYY-MM-DD')
console.log('aFormat:' + aFormat)//aFormat:2019-01-30

日期操作

//距离当前时间:七天
let sevenDaysAgo = moment().subtract(7, 'days').format('YYYY-MM-DD')
console.log('sevenDaysAgo:' + sevenDaysAgo)//sevenDaysAgo:2019-01-23

//距离当前时间:一周         
let oneWeekAgo = moment().subtract(1, 'weeks').format('YYYY-MM-DD')
console.log('oneWeekAgo:' + oneWeekAgo)//oneWeekAgo:2019-01-23

//距离当前时间:三个月                    
let threeMonthsAgo = moment().subtract(3, "months").format("YYYY-MM-DD")
console.log('threeMonthsAgo:' + threeMonthsAgo)//threeMonthsAgo:2018-10-30

//距离当前时间:一年                 
let oneYearAgo = moment().subtract(1, "years").format("YYYY-MM-DD")
console.log('oneYearAgo:' + oneYearAgo)//oneYearAgo:2018-01-30
减法，对应于：subtract（）方法
加法，对应于：add（）方法

根据身份证号码获得周岁年龄

let idCardNumber = '234567199302019929'
let birthday = idCardNumber.slice(6, 14)
console.log('出生日期:' + birthday)//出生日期:19930201
console.log('当前日期:' + moment().format("YYYY-MM-DD"))//当前日期:2019-01-30
let age = moment().diff(moment(birthday), 'years')
console.log('周岁年龄:' + age)//周岁年龄:25

日期与时间戳之间的转换

当涉及到日期的时间轴拖拽，那么通常需要把日期转换成时间戳来进行操作

//将日期转换成时间戳   
//moment().valueOf()  
//new Date().getTime()  
//Date.parse(new Date())

let timestamp1 = moment().unix();
let timestamp2 = moment().valueOf();
let timestamp3 = new Date().getTime();
let timestamp4 = Date.parse(new Date());

//将时间戳转换成日期   moment(时间戳).format()

let timestampToDate1 = moment(timestamp1).format("YYYY-MM-DD");
let timestampToDate2 = moment(timestamp2).format("YYYY-MM-DD");
let timestampToDate3 = moment(timestamp3).format("YYYY-MM-DD");
let timestampToDate4 = moment(timestamp4).format("YYYY-MM-DD");

console.log('timestamp1:' + timestamp1);//timestamp1:1550657032
console.log('timestamp2:' + timestamp2);//timestamp2:1550657032279
console.log('timestamp3:' + timestamp3);//timestamp3:1550657032279
console.log('timestamp4:' + timestamp4);//timestamp4:1550657032000

console.log('timestampToDate1:' + timestampToDate1);//timestampToDate1:1970-01-19
console.log('timestampToDate2:' + timestampToDate2);//timestampToDate2:2019-02-20
console.log('timestampToDate3:' + timestampToDate3);//timestampToDate3:2019-02-20
console.log('timestampToDate4:' + timestampToDate4);//timestampToDate4:2019-02-20

由上面的案例测试可知：

1. moment().unix() 获得的时间戳单位为秒
2. moment().valueOf() 等同于 new Date().getTime() 获得的时间戳单位为毫秒
3. Date.parse() 得到的值是以毫秒为单位的，且后三位默认为0，即不具体到毫秒
4. 如果想将时间戳转化为日期，moment的参数必须是毫秒为单位的,它就是识别为毫秒的，如果不是的话，会使结果出错