How to display just 'Today' with nothing else?

Question

I just want \'Today\' if the datetime is within today.

moment().calendar()  // \'Today at 5:08PM\'

Answer 1

Use a custom locale.

moment.locale('en-cust', {
    calendar: { /*replace calendar format strings*/
        lastDay: '[Yesterday at] LT',
        sameDay: '[Today]', // <---
        nextDay: '[Tomorrow at] LT',
        lastWeek: '[last] ffffdd [at] LT',
        nextWeek: 'ffffdd [at] LT',
        sameElse: 'L'
    }
});

After running that, moment().calendar(); will return "Today".

All non-calendar behaviour will maintain the default locale: 'en' behaviour.

Note that you need to replace the whole calendar object and not just the sameDay property.

Solution without hardcoding

I like this solution a lot but it does rely on a non-public momentjs api, localeData._calendar since there isn't a getter for this data. It also uses jquery for extend, let me know if you aren't using jquery.

function correctToday(locale,strf){
    // copy and extend the locale's calendar data
    var localeCal = $.extend({}, moment.localeData(locale)._calendar, {'sameDay':strf});
    // Replace the locale's calendar data with the modified one (uses public setter)
    moment.locale(locale,{calendar:localeCal});
}

// Usage
correctToday('en',"[today]");
correctToday('fr',"[aujourd'hui]");

And some test cases:

moment.locale();
moment().calendar(); //test changes
moment().subtract(22,'hours').calendar(); //test other cal functionality
moment().format(); //test non-cal functionality
moment().fromNow();

// Produces
// ["en", "today", "Yesterday at 12:09 PM", "2015-03-26T10:09:05-04:00", "a few seconds ago"]
// ["fr", "aujourd'hui", "Hier à 12:09", "2015-03-26T10:09:05-04:00", "il y a quelques secondes"]

Toggle

You can use functions in place of strings for locale settings. So, the correctToday function above remains the same but if we want a toggle, we call it like:

moment.timeOff = true; // this is the toggle, declare it somewhere globally accessible (I'm adding it to moment)
correctToday('en',function(){
    return moment.timeOff ? "[today]" : "[today at] LT";
});

If you don't like "[today at] LT" being hardcoded, store the original localeData._calendar before changing it and take the string from .sameDay.