Moment.js - tomorrow, today and yesterday

Question

You can also do this to get the date for today and tomorrow and yesterday

let today     = moment();

let tomorrow  = moment().add(1,'days');

let yesterday = moment().add(-1, 'days');

You can customize the way that both the .fromNow and the .calendar methods display dates using moment.updateLocale. The following code will change the way that .calendar displays as per the question:

moment.updateLocale('en', {
    calendar : {
        lastDay : '[Yesterday]',
        sameDay : '[Today]',
        nextDay : '[Tomorrow]',
        lastWeek : '[Last] dddd',
        nextWeek : '[Next] dddd',
        sameElse : 'L'
    }
});

Based on the question, it seems like the .calendar method would be more appropriate -- .fromNow wants to have a past/present prefix/suffix, but if you'd like to find out more you can read the documentation at http://momentjs.com/docs/#/customization/relative-time/.

To use this in only one place instead of overwriting the locales, pass a string of your choice as the first argument when you define the moment.updateLocale and then invoke the calendar method using that locale (eg. moment.updateLocale('yesterday-today').calendar( /* moment() or whatever */ ))

EDIT: Moment ^2.12.0 now has the updateLocale method. updateLocale and locale appear to be functionally the same, and locale isn't yet deprecated, but updated the answer to use the newer method.

I use a combination of add() and endOf() with moment

//...
const today = moment().endOf('day')
const tomorrow = moment().add(1, 'day').endOf('day')

if (date < today) return 'today'
if (date < tomorrow) return 'tomorrow'
return 'later'
//...

Requirements:

• When the date is further away, use the standard moment().fromNow() functionality.
• When the date is closer, show "today", "yesterday", "tomorrow", etc.

Solution:

// call this function, passing-in your date
function dateToFromNowDaily( myDate ) {

    // get from-now for this date
    var fromNow = moment( myDate ).fromNow();

    // ensure the date is displayed with today and yesterday
    return moment( myDate ).calendar( null, {
        // when the date is closer, specify custom values
        lastWeek: '[Last] dddd',
        lastDay:  '[Yesterday]',
        sameDay:  '[Today]',
        nextDay:  '[Tomorrow]',
        nextWeek: 'dddd',
        // when the date is further away, use from-now functionality             
        sameElse: function () {
            return "[" + fromNow + "]";
        }
    });
}

NB: From version 2.14.0, the formats argument to the calendar function can be a callback, see http://momentjs.com/docs/#/displaying/calendar-time/.

You can use this:

const today     = moment();

const tomorrow  = moment().add(1, 'days');

const yesterday = moment().subtract(1, 'days');

I have similar solution, but allows to use locales:

    let date = moment(someDate);
    if (moment().diff(date, 'days') >= 1) {
        return date.fromNow(); // '2 days ago' etc.
    }
    return date.calendar().split(' ')[0]; // 'Today', 'yesterday', 'tomorrow'