如何使用JavaScript将日期添加到当前日期?JavaScript是否有像.NET的AddDay()那样的内置函数?
当前回答
int days = 1;
var newDate = new Date(Date.now() + days * 24*60*60*1000);
代码笔
var天数=2;var newDate=新日期(Date.now()+天*24*60*60*1000);document.write(“今日:<em>”);document.write(new Date());document.write('</em><br/>新建:<strong>');document.write(newDate);
其他回答
完成此操作的最简单方法是使用日期fns库。
var addDays = require('date-fns/add_days')
addDays(date, amount)
此链接中提供了文档。您也可以使用moment.js完成此操作
希望它有帮助!
setDate()的mozilla文档并不表示它将处理月末场景。看见https://developer.mozilla.org/en-US/docs/JavaScript/Reference/Global_Objects/Date
设置日期()
根据当地时间设置指定日期的月份日期(1-31)。
这就是我在需要添加天数时使用setTime()的原因。
一些扩展Date的实现https://gist.github.com/netstart/c92e09730f3675ba8fb33be48520a86d
/**
* just import, like
*
* import './../shared/utils/date.prototype.extendions.ts';
*/
declare global {
interface Date {
addDays(days: number, useThis?: boolean): Date;
addSeconds(seconds: number): Date;
addMinutes(minutes: number): Date;
addHours(hours: number): Date;
addMonths(months: number): Date;
isToday(): boolean;
clone(): Date;
isAnotherMonth(date: Date): boolean;
isWeekend(): boolean;
isSameDate(date: Date): boolean;
getStringDate(): string;
}
}
Date.prototype.addDays = function(days: number): Date {
if (!days) {
return this;
}
this.setDate(this.getDate() + days);
return this;
};
Date.prototype.addSeconds = function(seconds: number) {
let value = this.valueOf();
value += 1000 * seconds;
return new Date(value);
};
Date.prototype.addMinutes = function(minutes: number) {
let value = this.valueOf();
value += 60000 * minutes;
return new Date(value);
};
Date.prototype.addHours = function(hours: number) {
let value = this.valueOf();
value += 3600000 * hours;
return new Date(value);
};
Date.prototype.addMonths = function(months: number) {
const value = new Date(this.valueOf());
let mo = this.getMonth();
let yr = this.getYear();
mo = (mo + months) % 12;
if (0 > mo) {
yr += (this.getMonth() + months - mo - 12) / 12;
mo += 12;
} else {
yr += ((this.getMonth() + months - mo) / 12);
}
value.setMonth(mo);
value.setFullYear(yr);
return value;
};
Date.prototype.isToday = function(): boolean {
const today = new Date();
return this.isSameDate(today);
};
Date.prototype.clone = function(): Date {
return new Date(+this);
};
Date.prototype.isAnotherMonth = function(date: Date): boolean {
return date && this.getMonth() !== date.getMonth();
};
Date.prototype.isWeekend = function(): boolean {
return this.getDay() === 0 || this.getDay() === 6;
};
Date.prototype.isSameDate = function(date: Date): boolean {
return date && this.getFullYear() === date.getFullYear() && this.getMonth() === date.getMonth() && this.getDate() === date.getDate();
};
Date.prototype.getStringDate = function(): string {
// Month names in Brazilian Portuguese
const monthNames = ['Janeiro', 'Fevereiro', 'Março', 'Abril', 'Maio', 'Junho', 'Julho', 'Agosto', 'Setembro', 'Outubro', 'Novembro', 'Dezembro'];
// Month names in English
// let monthNames = ['January', 'February', 'March', 'April', 'May', 'June', 'July', 'August', 'September', 'October', 'November', 'December'];
const today = new Date();
if (this.getMonth() === today.getMonth() && this.getDay() === today.getDay()) {
return 'Hoje';
// return "Today";
} else if (this.getMonth() === today.getMonth() && this.getDay() === today.getDay() + 1) {
return 'Amanhã';
// return "Tomorrow";
} else if (this.getMonth() === today.getMonth() && this.getDay() === today.getDay() - 1) {
return 'Ontem';
// return "Yesterday";
} else {
return this.getDay() + ' de ' + this.monthNames[this.getMonth()] + ' de ' + this.getFullYear();
// return this.monthNames[this.getMonth()] + ' ' + this.getDay() + ', ' + this.getFullYear();
}
};
export {};
编辑:您可以这样做,而不是setTime()(或setHours()):
Date.prototype.addDays= function(d){
this.setDate(this.getDate() + d);
return this;
};
var tomorrow = new Date().addDays(1);
Old:
可以使用setHours()代替setTime():
Date.prototype.addDays= function(d){
this.setHours(this.getHours() + d * 24);
return this;
};
var tomorrow = new Date().addDays(1);
查看JSFiddle。。。
这些答案让我感到困惑,我更喜欢:
var ms = new Date().getTime() + 86400000;
var tomorrow = new Date(ms);
getTime()给出了自1970年以来的毫秒数,86400000是一天中的毫秒数。因此,ms包含所需日期的毫秒。
使用毫秒构造函数可以得到所需的日期对象。