我想获得一个日期对象,它比另一个日期对象晚30分钟。我如何用JavaScript做到这一点?
当前回答
下面是我的一句话:
console.log('time: ', new Date(new Date().valueOf() + 60000))
其他回答
这是IsoString的版本:
console.log(new Date(new Date().setMinutes(new Date().getMinutes() - (30))).toISOString());
let d = new Date();
d.setMinutes(d.getMinutes() + 30);
// console.log(d)
以下是ES6版本:
let getTimeAfter30Mins = () => {
let timeAfter30Mins = new Date();
timeAfter30Mins = new Date(timeAfter30Mins.setMinutes(timeAfter30Mins.getMinutes() + 30));
};
这样称呼它:
getTimeAfter30Mins();
我总是创建7个函数,在JS中使用date: addSeconds, addMinutes, addHours, addDays, addWeeks, addMonths, addYears。
你可以在这里看到一个例子:http://jsfiddle.net/tiagoajacobi/YHA8x/
使用方法:
var now = new Date();
console.log(now.addMinutes(30));
console.log(now.addWeeks(3));
这些是函数:
Date.prototype.addSeconds = function(seconds) {
this.setSeconds(this.getSeconds() + seconds);
return this;
};
Date.prototype.addMinutes = function(minutes) {
this.setMinutes(this.getMinutes() + minutes);
return this;
};
Date.prototype.addHours = function(hours) {
this.setHours(this.getHours() + hours);
return this;
};
Date.prototype.addDays = function(days) {
this.setDate(this.getDate() + days);
return this;
};
Date.prototype.addWeeks = function(weeks) {
this.addDays(weeks*7);
return this;
};
Date.prototype.addMonths = function (months) {
var dt = this.getDate();
this.setMonth(this.getMonth() + months);
var currDt = this.getDate();
if (dt !== currDt) {
this.addDays(-currDt);
}
return this;
};
Date.prototype.addYears = function(years) {
var dt = this.getDate();
this.setFullYear(this.getFullYear() + years);
var currDt = this.getDate();
if (dt !== currDt) {
this.addDays(-currDt);
}
return this;
};
对于像我这样的懒人:
Kip的答案(从上面)在coffeescript中,使用“enum”,并对同一对象进行操作:
Date.UNIT =
YEAR: 0
QUARTER: 1
MONTH: 2
WEEK: 3
DAY: 4
HOUR: 5
MINUTE: 6
SECOND: 7
Date::add = (unit, quantity) ->
switch unit
when Date.UNIT.YEAR then @setFullYear(@getFullYear() + quantity)
when Date.UNIT.QUARTER then @setMonth(@getMonth() + (3 * quantity))
when Date.UNIT.MONTH then @setMonth(@getMonth() + quantity)
when Date.UNIT.WEEK then @setDate(@getDate() + (7 * quantity))
when Date.UNIT.DAY then @setDate(@getDate() + quantity)
when Date.UNIT.HOUR then @setTime(@getTime() + (3600000 * quantity))
when Date.UNIT.MINUTE then @setTime(@getTime() + (60000 * quantity))
when Date.UNIT.SECOND then @setTime(@getTime() + (1000 * quantity))
else throw new Error "Unrecognized unit provided"
@ # for chaining