Arduino IDE

I need a little help about testing my code.  I have wrote a program in Arduino that uses a clock to turn relays on and off.  There are 4 relays that turn on depending on week day hour min.  These relays turn on at different times of the day week hour or min.  I want to run this program over a week for testing to be sure that all is ok.  What can I use that over that week i can have some kind of log telling me when each relay came on and turn off.  Thanks for the help.