hey, lucasvickers - did you get the issue sorted?
i was having a similar issue. it looked like my time was resetting every time I started the serial port monitor in the Arduino environment. The problem is that I'd forgotten that the setup{} code on an Arduino runs every time that the serial connection is established. I had removed the comments from Matt's library so that I could set the clock to the correct time and that code was re-running every time I connected the serial monitor.