javascript 检查用户输入的日期是当前日期还是未来日期
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check whether the date entered by the user is current date or the future date
提问by Ryan decosta
I was browsing through the net to find a javascript function which can check whether the date entered by the user is current date or the future date but i didn't found a suitable answer so i made it myself.Wondering If this can be achieved by one line code.
我正在网上浏览以找到一个 javascript 函数，它可以检查用户输入的日期是当前日期还是未来日期，但我没有找到合适的答案，所以我自己做了。想知道这是否可以通过一行代码。
function isfutureDate(value)
{
var now = new Date;
var target = new Date(value);
if (target.getFullYear() > now.getFullYear())
{
return true;
}
else if(target.getFullYear() == now.getFullYear())
{
if (target.getMonth() > now.getMonth()) {
return true;
}
else if(target.getMonth() == now.getMonth())
{
if (target.getDate() >= now.getDate()) {
return true;
}
else
{
return false
}
}
}
else{
return false;
}
}
回答by Reinherd
You can compare two dates as if they were Integers:
您可以比较两个日期，就好像它们是整数一样：
var now = new Date();
if (before < now) {
// selected date is in the past
}
Just both of them must be Date.
只是他们两个都必须是Date。
First search in google leads to this: Check if date is in the past Javascript
在 google 中的第一次搜索导致：检查日期是否在过去 Javascript
However, if you love programming, here's a tip:
但是，如果您喜欢编程，这里有一个提示：
- A date formatted like YYYY-MM-DD could be something like 28-12-2013.
- And if we reverse the date, it is 2013-12-28.
- We remove the colons, and we get 20131228.
- We set an other date: 2013-11-27 which finally is 20131127.
- We can perform a simple operation: 20131228 - 20131127
- 格式为 YYYY-MM-DD 的日期可能类似于 28-12-2013。
- 如果我们颠倒日期，那就是 2013-12-28。
- 我们去掉冒号，我们得到 20131228。
- 我们设置了另一个日期：2013-11-27，最终是 20131127。
- 我们可以执行一个简单的操作：20131228 - 20131127
Enjoy.
享受。
回答by denov
here's a version that only compares the date and excludes the time.
这是一个仅比较日期而排除时间的版本。
Typescript
打字稿
const inFuture = (date: Date) => {
return date.setHours(0,0,0,0) > new Date().setHours(0,0,0,0)
};
ES6
ES6
const inFuture = (date) => {
return date.setHours(0,0,0,0) > new Date().setHours(0,0,0,0)
};
回答by Prajakta Kale
try this
试试这个
function IsFutureDate(dateVal) {
var Currentdate = new Date();
dateVal= dateVal.split("/");
var year = Currentdate.getFullYear();
if (year < dateVal[2]) {
return false;//future date
}
else {
return true; //past date
}
}
回答by Khalid Habib
try out this
试试这个
function isFutureDate(idate){
var today = new Date().getTime(),
idate = idate.split("/");
idate = new Date(idate[2], idate[1] - 1, idate[0]).getTime();
return (today - idate) < 0 ? true : false;
}
Demo
演示
console.log(isFutureDate("02/03/2016")); // true
console.log(isFutureDate("01/01/2016")); // false
回答by Seth
ES6 version with tolerable future option.
ES6 版本，具有可容忍的未来选项。
I made this little function that allows for some wiggle room (incase data coming in is from a slightly fast clock for example).
我做了这个小功能，允许一些摆动空间（例如，传入的数据来自一个稍微快一点的时钟）。
It takes a Dateobject and toleranceMilliswhich is the number of seconds into the future that is acceptable (defaults to 0).
它需要一个Date对象，toleranceMillis它是可接受的未来秒数（默认为 0）。
const isDistantFuture = (date, toleranceMillis = 0) => {
// number of milliseconds tolerance (i.e. 60000 == one minute)
return date.getTime() > Date.now() + toleranceMillis
}
