how do i add 30 days to a timestamp? rather, what is the timestamp value for 30 days?

Question

am using a PHP/MySQL system

Answer 1

Use the PHP function strtotime().

Example:
$newdate=strtotime("+30 days");

You can also add an optional parameter (a unix date) after the period you wish to add/subtract. See the source link for more info.

Answer 2

You cant define the timestamp for 30 days since it changes every second...
but you can calculate it use this code. This example shows subtracting 30 mins from the current time
you can do
$hours + 30 for 30 timestamp


$timestamp = time();
$date_time_array = getdate($timestamp);
$hours = $date_time_array['hours'];
$minutes = $date_time_array['minutes'];
$seconds = $date_time_array['seconds'];
$month = $date_time_array['mon'];
$day = $date_time_array['mday'];
$year = $date_time_array['year'];

// use mktime to recreate the unix timestamp
$timestamp = mktime($hours,$minutes - 30,$seconds,$month,$day,$year);
$delaytime = $timestamp;