18 April

18 April is the 108th day of the year in the Gregorian calendar, which is the most widely used calendar worldwide. In leap years it is the 109th day. There are 257 days remaining in the year.

April is the fourth month of the year and has 30 days. 18 April falls during spring in the Northern and Southern hemispheres at different times: in the Northern Hemisphere it is spring, while in the Southern Hemisphere it is autumn.

Calendar systems

The Gregorian calendar was introduced in 1582, replacing the Julian calendar to correct errors in the calculation of the year length. For this reason, events dated 18 April in earlier history may have been recorded differently in the two calendars. According to the Julian calendar, still used by some Eastern Orthodox churches, 18 April in the Gregorian calendar corresponds to 5 April in the Julian calendar during the twentieth and twenty-first centuries.

Observances and international days

18 April is marked as the International Day for Monuments and Sites, also known as World Heritage Day. It was proposed by ICOMOS and adopted by UNESCO. Its purpose is to raise public awareness of the importance of preserving historic buildings and sites.

Several countries observe national events on this date. For example, Zimbabwe recognizes 18 April as Independence Day, commemorating the year 1980.

Zodiac sign

People born on 18 April, according to Western zodiac tradition, fall under the sign of Aries, which typically ends around 19 or 20 April. This is a cultural convention and is not based on science.