Most countries in the world use the Gregorian calendar as their sole civil calendar. Countries which do not use the Gregorian calendar are Afghanistan and Iran, which use the Solar Hijri calendar, Ethiopia (Ethiopian calendar) and Nepal (Vikram Samvat). Some countries use other calendars alongside the Gregorian calendar: Bangladesh (Bangla calendar), India (Indian national calendar) and Israel (Hebrew calendar).

is it the same year in every country?
no