how to put condition for date type data

I have table for tasks list.

how can I create condition for dates?

I want to give red color for tasks that their targerDate are in 2 days or less.

    $mainQuery = mysql_query("SELECT * FROM `tasks `");
    while($mainIndex = mysql_fetch_array($mainQuery)) 
{
if ($mainIndex['tagertDate'] <= ???)
}

sql table:

id  int(10) 
title   varchar(250)    utf8_general_ci
targetDate  date    
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