Language Confusion

One evening two friends, Carmen and Ana, were talking in Spanish via instant messenger. Both women were from Sevilla, Spain but Carmen was currently in Rome, Italy. Both friends traveled a lot and did not often get to spend time together, so they agreed to meet at a certain tourist attraction the following evening. When the appointed time rolled around and Carmen wasn't there, Ana called her on her cell phone. Carmen insisted she was in the right place, and that Ana was the one that was late. Eventually the confusion was sorted out, and it was discovered that both women were technically right. How is this possible?