print time yesteraday 7am and today 7am in UNIX timestamp

I have to two variables $cronlast and $cronnow in my php code.
I need to have the time 7am of previous day in $cronlast variable and 7am today in $cronnow variable.
I need the time in UNIX timestamp format.
So everyday when I print the variable I should have:

$cronlast=7am Yesterday(in Unix Timestamp)
$cronnow=7am Today(in Unix Timestamp)

I would appreciate any help.

http://www.php.net/strtotime

$cronlast = strtotime( 'yesterday 7:00 AM' );
$cronnow = strtotime( 'today 7:00 AM' );

thanks

strtotime can do that:

$todayAt7 = strtotime('07:00');
$yesterdayAt7 = strtotime('yesterday 07:00');



Not even a close beat today :P