Calendar Time1.3.0+

moment().calendar();
moment().calendar(referenceTime);
moment().calendar(referenceTime, formats);  // from 2.10.5

Calendar time displays time relative to a given referenceTime (defaults to now), but does so slightly differently than moment#fromNow.

moment#calendar will format a date with different strings depending on how close to referenceTime's date (today by default) the date is.

These strings are localized, and can be customized.

From 2.10.5 moment supports specifying calendar output formats perinvocation:

moment().calendar(null, {
    sameDay: '[Today]',
    nextDay: '[Tomorrow]',
    nextWeek: 'dddd',
    lastDay: '[Yesterday]',
    lastWeek: '[Last] dddd',
    sameElse: 'DD/MM/YYYY'
});

sameElse is used as the format when the moment is more than a week away from the referenceTime

Note: From version 2.14.0 the formats argument to calendar can bea callback that is executed within the moment context with a single argumentnow:

moment().calendar(null, {
  sameDay: function (now) {
    if (this.isBefore(now)) {
      return '[Will Happen Today]';
    } else {
      return '[Happened Today]';
    }
    /* ... */
  }
});