Date Formatting

hi,
following code gives me date in seconds passed since 1971.

$nextmonth = mktime(0, 0, 0, date(“m”)+1, date(“d”),date(“Y”));
ex- $nextmonth=110098746

can ne1 tell me hw to convert it into international format.
example—2006/01/30

(110098746 to 2006/01/30)

help appreciated…

thanx in advance…