10-calendar.md

title	version	signature
Calendar	1.3.0	// From 2.12.0 onward moment.updateLocale('en', { calendar : Object }); // From 2.8.1 to 2.11.2 moment.locale('en', { calendar : Object }); // Deprecated in 2.8.1 moment.lang('en', { calendar : Object });

Locale#calendar should have the following formatting strings.

moment.locale('en', {
    calendar : {
        lastDay : '[Yesterday at] LT',
        sameDay : '[Today at] LT',
        nextDay : '[Tomorrow at] LT',
        lastWeek : '[last] dddd [at] LT',
        nextWeek : 'dddd [at] LT',
        sameElse : 'L'
    }
});

Each of the Locale#calendar keys can also be a callback function with the scope of the current moment and first argument a moment that depicts now. It should return a formatting string.

function callback (now) {
    return '[hoy a la' + ((this.hours() !== 1) ? 's' : '') + '] LT';
}