Relative time formatting

time_formatter.coffee

TimeFormatter =
  to_pretty: (date)->
    now = new Date()
    date = new Date(date)

    # Time ago in seconds
    a = (now - date) / 1000

    if a is 0 then 'akkurat nå'
    else if a is 1 then 'ett sekund siden'
    else if 2 <= a <= 59 then "#{Math.round(a)} sekunder siden"
    else if 60 <= a <= 119 then "ett minutt siden"
    else if 120 <= a <= 3540 then "#{Math.round(a / 60)} minutter siden"
    else if 3541 <= a <= 7100 then "en time siden"
    else if 7101 <= a <= 82800 then "#{Math.round((a + 99) / 3600)} timer siden"
    else if 82801 <= a <= 172000 then "en dag siden"
    else if 172001 <= a <= 518400 then "#{Math.round((a + 800) / (60 * 60 * 24))} dager siden"
    else "#{Math.round((a + 180000) / (60 * 60 * 24 * 7))} uker siden"

time_formatter.php

<?php
	class TimeFormatter {
		private $datetime;

		public static function to_pretty($datetime) {
			$datetime = new DateTime($datetime);
			$now = new DateTime();
			$interval = $now->diff($datetime);
			$seconds_ago = self::interval_to_seconds($interval);

			if ($seconds_ago == 0) {
				return 'akkurat nå';
			}
			if ($seconds_ago == 1) {
				return 'ett sekund siden';
			}
			else if(self::in_range($seconds_ago, 2, 59)) {
				return $seconds_ago.' sekunder siden';
			}
			else if(self::in_range($seconds_ago, 60, 119)) {
				return 'ett minutt siden';
			}
			else if(self::in_range($seconds_ago, 120, 3540)) {
				return round($seconds_ago / 60).' minutter siden';
			}
			else if(self::in_range($seconds_ago, 3541, 7100)) {
				return "en time siden";
			}
			else if(self::in_range($seconds_ago, 7101, 82800)) {
				return round(($seconds_ago + 99) / 3600).' timer siden';
			}
			else if(self::in_range($seconds_ago, 82801, 172000)) {
				return "en dag siden";
			}
			else if(self::in_range($seconds_ago, 172001, 518400)) {
				return round(($seconds_ago + 800) / (60 * 60 * 24)).' dager siden';
			}
			else if(self::in_range($seconds_ago, 518401, 1036800)) {
				return "en uke siden";
			}

			return round(($seconds_ago + 180000) / (60 * 60 * 24 * 7)).' uker siden';
		}

		private static function interval_to_seconds($interval) {
			return ($interval->y * 365 * 24 * 60 * 60) +
               ($interval->m * 30 * 24 * 60 * 60) +
               ($interval->d * 24 * 60 * 60) +
               ($interval->h * 60 *60) +
               ($interval->i * 60) +
               $interval->s;
		}

		private static function in_range($i, $from, $to) {
			return $i >= $from && $i <= $to;
		}
	}