If you find that the date and times of tasks that you have in the system, or even scheduled campaigns are coming out at different times/dates, then you need to update your region/time and date information.

To do this, you simply go to My Account (found at the top of the screen) and then selecting Account Details from the drop down. It's on this screen that you can change most things to do with your account but more importantly, you can adjust the Time Zone option in order to set it to your local times!