Moment JS - check if a date is today or in the fut

问题:

I am trying to use momentjs to check if a given date is today or in the future.

This is what I have so far:

<script type="text/javascript" src="http://momentjs.com/downloads/moment.min.js"></script>
<script type="text/javascript">

var SpecialToDate = '31/01/2014'; // DD/MM/YYYY

var SpecialTo = moment(SpecialToDate, "DD/MM/YYYY");
if (moment().diff(SpecialTo) > 0) {
    alert('date is today or in future');
} else {
    alert('date is in the past');
}

</script>

The code is evaluating my date (31st of Jan 2014) as a date in past.

Any idea what I am doing wrong?

回答1:

After reading the documentation: http://momentjs.com/docs/#/displaying/difference/, you have to consider the diff function like a minus operator.

                   // today < future (31/01/2014)
today.diff(future) // today - future < 0
future.diff(today) // future - today > 0

Therefore, you have to reverse your condition.

If you want to check that all is fine, you can add an extra parameter to the function:

moment().diff(SpecialTo, 'days') // -8 (days)

回答2:

use isSame function

var iscurrentDate = startTime.isSame(new Date(), "day");
if(iscurrentDate)
{
}

回答3:

// Returns true if it is today or false if it's not
moment(SpecialToDate).isSame(moment(), 'day');

回答4:

You can use the isAfter() query function of momentjs:

Check if a moment is after another moment.

moment('2010-10-20').isAfter('2010-10-19'); // true

If you want to limit the granularity to a unit other than milliseconds, pass the units as the second parameter.

moment('2010-10-20').isAfter('2010-01-01', 'year'); // false

moment('2010-10-20').isAfter('2009-12-31', 'year'); // true

http://momentjs.com/docs/#/query/is-after/

回答5:

Since no one seems to have mentioned it yet, the simplest way to check if a Moment date object is in the past:

momentObj.isBefore()

Or in the future:

momentObj.isAfter()

Just leave the args blank -- that'll default to now.

There's also isSameOrAfter and isSameOrBefore.

N.B. this factors in time. If you only care about the day, see Dipendu's answer.

回答6:

To check if it is today:

If we compare two dates which contain also the time information isSame will obviously fail. diff will fail in case that the two dates span over the new day:

var date1 = moment("01.01.2016 23:59:00", "DD.MM.YYYY HH.mm.ss");
var date2 = moment("02.01.2016 00:01:00", "DD.MM.YYYY HH.mm.ss");
var diff = date2.diff(date1); // 2seconds

I think the best way, even if it is not quick and short, is the following:

var isSame = date1.date() == date2.date() && date1.month() == date2.month() && date1.year() == date2.year()

To check if it is in the future:

As suggested also by other users, the diff method works.

var isFuture = now.diff(anotherDate) < 0 

回答7:

If you only need to know which one is bigger, you can also compare them directly:

var SpecialToDate = '31/01/2014'; // DD/MM/YYYY

var SpecialTo = moment(SpecialToDate, "DD/MM/YYYY");
if (moment() > SpecialTo) {
    alert('date is today or in future');
} else {
    alert('date is in the past');
}

Hope this helps!

回答8:

invert isBefore method of moment to check if a date is same as today or in future like this:

!moment(yourDate).isBefore(moment(), "day");

回答9:

if firstDate is same or after(future) secondDate return true else return false. Toda is firstDate = new Date();

  static isFirstDateSameOrAfterSecondDate(firstDate: Date, secondDate: Date): boolean {
    var date1 = moment(firstDate);
    var date2 = moment(secondDate);
    if(date1 && date2){
      return date1.isSameOrBefore(date2,'day');
    }
    return false;
  }

There is isSame, isBefore and isAfter for day compare moment example;

  static isFirstDateSameSecondDate(firstDate: Date, secondDate: Date): boolean {
    var date1 = moment(firstDate);
    var date2 = moment(secondDate);
    if (date1 && date2) {
      return date1.isSame(date2,'day');
    }
    return false;
  }

  static isFirstDateAfterSecondDate(firstDate: Date, secondDate: Date): boolean {
    var date1 = moment(firstDate);
    var date2 = moment(secondDate);
    if(date1 && date2){
      return date1.isAfter(date2,'day');
    }
    return false;
  }

  static isFirstDateBeforeSecondDate(firstDate: Date, secondDate: Date): boolean {
    var date1 = moment(firstDate);
    var date2 = moment(secondDate);
    if(date1 && date2){
      return date1.isBefore(date2,'day');
    }
    return false;
  }

回答10:

Use the simplest one to check for future date

if(moment().diff(yourDate) >=  0)
     alert ("Past or current date");
else
     alert("It is a future date");

回答11:

function isTodayOrFuture(date){
  date = stripTime(date);
  return date.diff(stripTime(moment.now())) >= 0;
}

function stripTime(date){
  date = moment(date);
  date.hours(0);
  date.minutes(0);
  date.seconds(0);
  date.milliseconds(0);
  return date;
}

And then just use it line this :

isTodayOrFuture(YOUR_TEST_DATE_HERE)

回答12:

Just in case someone else needs this, just do this:

const isToday = moment(0, "HH").diff(date, "days") == 0;

or if you want a function:

isToday = date => moment(0,"HH").diff(date, "days") == 0;

Where date is the date you want to check for.

Explanation

moment(0, "HH") returns today's day at midnight.

date1.diff(date2, "days") returns the number of days between the date1 and date2.

回答13:

Select yesterday to check past days or not with help of moment().subtract(1, "day");

Reference:- http://momentjs.com/docs/#/manipulating/subtract/

function myFunction() {
  var yesterday = moment().subtract(1, "day").format("YYYY-MM-DD");
  var SpecialToDate = document.getElementById("theDate").value;

  if (moment(SpecialToDate, "YYYY-MM-DD", true).isAfter(yesterday)) {
    alert("date is today or in future");
    console.log("date is today or in future");
  } else {
    alert("date is in the past");
    console.log("date is in the past");
  }
}

<script src="http://momentjs.com/downloads/moment.js"></script>
<input type="date" id="theDate" onchange="myFunction()">

回答14:

i wanted it for something else but eventually found a trick which you can try

somedate.calendar(compareDate, { sameDay: '[Today]'})=='Today'

var d = moment();
 var today = moment();
 
 console.log("Usign today's date, is Date is Today? ",d.calendar(today, {
    sameDay: '[Today]'})=='Today');
    
 var someRondomDate = moment("2012/07/13","YYYY/MM/DD");
 
 console.log("Usign Some Random Date, is Today ?",someRondomDate.calendar(today, {
    sameDay: '[Today]'})=='Today');
    
  
 var anotherRandomDate =  moment("2012/07/13","YYYY/MM/DD");
 
 console.log("Two Random Date are same date ? ",someRondomDate.calendar(anotherRandomDate, {
    sameDay: '[Today]'})=='Today');

<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.18.1/moment.min.js"></script>

回答15:

If we want difference without the time you can get the date different (only date without time) like below, using moment's format.

As, I was facing issue with the difference while doing ;

moment().diff([YOUR DATE])

So, came up with following;

const dateValidate = moment(moment().format('YYYY-MM-DD')).diff(moment([YOUR SELECTED DATE HERE]).format('YYYY-MM-DD'))

IF dateValidate > 0 
   //it's past day
else
   //it's current or future

Please feel free to comment if there's anything to improve on.

Thanks,