I have had a quick look at your site and I see this JS
var cdate="<small><font color='000000' face='Arial'><b>"
+dayarray[day]+", "+montharray[month]+" "+daym+", "+year+"
"+hours+":"+minutes+":"+seconds+" "+dn
+"</b></font></small>"
The use of the font tag is not recommended because it is being withdrawn
from later versions of HTML
So you could try using CSS, which allows you to specify the font size as a
percentage, so you can experiment to get the size that you want, e.g.
var cdate="<div style="color: black; font: bold 75% arial,sans-serif>"
+dayarray[day]+", "+montharray[month]+" "+daym+", "+year+"
"+hours+":"+minutes+":"+seconds+" "+dn +"</div>"