strtotime() question

Hello, I'm not even quite sure if I am posting this message in the right place, so please bear with me. I have a question regarding the strtotime() function. I am developing a PHP script to handle dates for my web site, and I need an easy way to get from today to tomorrow to +2 days to +3 days... you get the idea... all the way up to +90 days. The strtotime() function seems ideal because the script can easily put in "+51 days" and it knows what to do. My question is how does it handle Daylight Savings Time? The program I was previously using (written in Perl) actually jumped a day or duplicated a day when DST was coming up or ending. When using the "+19 days" syntax in the strtotime() function, does it take into account DST and not cause similar problems? Thank you very much for any help. ~Kyle Bisignani