imap_search date format

[thompsma]

I am having a difficult time getting the proper 'date/time' format for the imap_search() function.  I need to search for messages that have arrive in the last 40 minutes.

 

This code DOESN'T work:

 

//setting date/time variables

date_default_timezone_set("America/Los_Angeles"); //setting default timezone

$default_tz = date_default_timezone_get();

$current_date = date("D, j M Y H:i:s"); //current datetime

$my_strtotime = "-40 minutes";

$past_date = date("D, j M Y H:i:s",strtotime($my_strtotime)); //datetime in past

 

//some php code

 

imap_search($mbox,"SINCE \"$past_date\"");

 

//some more php code

 

I have messages in the mailbox that have arrived in the last 40 minutes, but it is still coming up as false.  I was reading that the date/time format is critical, but cannot find what the format should be.