Description:
------------
This seems related to the open bug involving "now" 
resetting to midnight of the current day, but it's not 
identical.

If you try to adjust a time by passing strtotime() an 
offset like "+2 hours", you get that offset relative to 
midnight.  In other words, strtotime("+2 hours", 
$unixtimestamp) returns a timestamp for 2 a.m, of the 
day referenced by $unixtimestamp, or of the current day 
if the second argument is omitted.

Reproduce code:
---------------
// in PHP 4, this correctly returns 3:30 p.m. on Jan 1, 2005 but in PHP 5.0.1 returns 2:00 a.m. on Jan 1, 2005:

$timeStamp = strtotime("+2 hours", strtotime("1/1/2005 1:30pm"));
echo date("r", $timeStamp);


// in PHP 4, this correctly returns a date/time for two hours from now, but in PHP 5.0.1 it returns 2 a.m. on the current day:
$timeStamp = strtotime("+2 hours");
echo date("r", $timeStamp);

Expected result:
----------------
two hours from given date and time or from now, 
depending on whether a second timestamp argument was 
provided to strtotime();

Actual result:
--------------
2 a.m. on relevant date.