As Antarctica is mostly uninhabited, the continent is not officially divided into time zones. However, a number of existing research stations use either the time zone of the country that operates or supplies them, or use the local time of countries located nearby. For example, McMurdo Station observes New Zealand Standard Time (NZST) during standard time and New Zealand Daylight Time (NZDT) during the Daylight Saving Time (DST) period in New Zealand. Palmer Station (an American research station) keeps Chile Summer Time (CLST) as Chile is the closest country to their station.