It's easy to do.
Some countries begin daylight savings at different times than others.
Some don't observe daylight savings at all, effectively putting them in a different time zone for half the year. There is help available, though. The following links can help you make sense of the situation, and make communicating with other parts of the globe a lot easier. The Time Zone Page can tell you with one click of the mouse what time it is in over 600 cities worldwide. Another handy resource is this Time-Zone Map .