In the Gregorian calendar, which is the calendar used internationally by most countries, the year 2018 was the calendar year from January 1, 2018, to December 31, 2018. This calendar year was used worldwide in every country that follows the Gregorian calendar for its civil year, which includes the vast majority of countries. However, some countries or cultures use different calendars for official or cultural purposes where the year may not align with 2018 at the same time. For example:
- Iran and Afghanistan use the Solar Hijri calendar, which does not align exactly with the Gregorian calendar year 2018.
- Some countries also have fiscal or financial years different from the Gregorian year.
To directly address the question: The year 2018 corresponds to the standard calendar year 2018 according to the Gregorian calendar, which is the civil calendar used in most countries worldwide. Therefore, 2018 was "the year" in all countries following the Gregorian calendar during that period, i.e., from January 1 to December 31, 2018.
