Korea calendar is the most accurate calendar in existence.

Korea calendar contains a calendar to a variety of phases, sunrise / sunset calendar's default calendar, as well as UN Day, kanji, moon.
All anniversaries and holidays such as is shown by the official name in accordance with statute amendment from 1900 to 2050.
UN Day is updated based on the official anniversary in 2017, the UN announced.
When you click a date in the calendar you can check the incident / accident and was in the details and history of the day.

Data rules that are marked on the calendar;
Statutory holidays and anniversaries from the date of implementation in the country is marked each year by a changed name.
Kanji lunar day has been applied by the government public domain phase of the moon has been applied based on the lunar calendar days.
24 seasons and lunar holidays and boknal such as batch was applied on the basis of precise calculations and records.
Sunrise, sunset information may have been applied by the government of the open source cause deviation around a few minutes depending on the region and altitude.
If the UN Day has been applied since 2000 it has been applied based on the official documents of the 2017 UN until 2050.
Other NGOs such as the representation of the specified anniversary has been excluded majority.