| This script starts by setting a variable
now equal to the present DATE(). Next a variable then is set equal to the date to be counted down
to.
In the next line, var gap = then.getTime() -
now.getTime();, the variable gap is
set equal to the number of milliseconds between the present date and
the time to count down to.
Why milliseconds? Because the date.getTime() method returns the number of
milliseconds between the specified date and midnight (GMT) January
1, 1970. Since both today's date and the date to countdown to are
being compared to the same time, subtracting today from the future
date gives us the gap between them in milliseconds.
This line, dleft = Math.floor(gap / (1000 * 60 *
60 * 24)); converts this gap to days and rounds it down to
the nearest integer.
The next line converts the rounded down number of days to hours,
(dleft *24) and subtracts it from the gap,
which has also been converted to hours, (gap/(1000*60*60)) and, like the method in the
previous line, rounds it down to the nearest integer.
The last line uses the document.write()
method to print the result on the web page.
| 