I have a problem with date differences. There's a time difference with the server and the country that the site serves and I need to add 6 hours and 51 minutes to the time. I know how to do this but there is a problem with the date. I also want to add one day to the date if the time adding exceeds the midnight. I mean, if the difference between the server's time and the midnight is smaller then 6 hours and 51 minutes I need to add one day to the date. How can I do this?