leaflet-environmental-layers/src/util/timeago.js

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TimeAgo = function TimeAgo() {
  var self = {};

  // Public Methods
  self.locales = {
    prefix: '',
    sufix: 'ago',

    seconds: '1 minute',
    minute: '1 minute',
    minutes: '%d minutes',
    hour: '1 hour',
    hours: '%d hours',
    day: '1 day',
    days: '%d days',
    month: '1 month',
    months: '%d months',
    year: '1 year',
    years: '%d years'
  };

  self.inWords = function (timeAgo) {

    var seconds = Math.floor((new Date() - new Date(timeAgo)) / 1000),
      separator = this.locales.separator || ' ',
      words = this.locales.prefix + separator,
      interval = 0,
      intervals = {
        year: seconds / 31536000,
        month: seconds / 2592000,
        day: seconds / 86400,
        hour: seconds / 3600,
        minute: seconds / 60
      };

    var distance = this.locales.seconds;

    for (var key in intervals) {
      interval = Math.floor(intervals[key]);

      if (interval > 1) {
        distance = this.locales[key + 's'];
        break;
      } else if (interval === 1) {
        distance = this.locales[key];
        break;
      }
    }

    distance = distance.replace(/%d/i, interval);
    words += distance + separator + this.locales.sufix;

    return words.trim();
  };

  return self;
};