// example : <span since="578556600"></span>

function updateSince($this) {
	var ts_since = $this.attr('since')*1;
	var ts_now = Math.round(Date.now()/1000);
	var s_total = Math.max(ts_now-ts_since,0);
	var y = Math.floor(s_total/31536000);
	var m = Math.floor(s_total/2592000);
	var d = Math.floor(s_total/86400);
	var h = Math.floor(s_total/3600);
	var i = Math.floor((s_total-h*3600)/60);
	var s = s_total-h*3600-i*60;
	if (y)
		$this.html(y+' year'+((y>1)?'s':''));
	else if (m)
		$this.html(m+' month'+((m>1)?'s':''));
	else if (d)
		$this.html(d+' day'+((d>1)?'s':''));
	else if (h)
		$this.html(h+' hour'+((h>1)?'s':''));
	else if (i)
		$this.html(i+' minute'+((i>1)?'s':''));
	else if (s>20)
		$this.html('a few moments');
	else
		$this.html('a few seconds');
}
jQuery('[since]').each(function() {
	var $this = jQuery(this);
	updateSince($this);
	var interval = setInterval(function() {
		updateSince($this);
	},1000);
});