Prepend to container instead of append

If the countdown container already contained some elements, It
previously kept them in top and place the countdown elements below. Now,
it will place the countdown elements above the existing elements.
Recommended date format replaced to support safari.

Previous date format(YYYY-MM-DDThh:mmTZD) did not support safari. This
date format is replaced with(YYYY/MM/DD hh:mm:ss +TZD) to support all
browsers.