1678 is a date in the 17th century AD.
A century is 100 years long.
every hundred years makes a century
Since a century is 100 years, half a century would be 50. So, the answer is 50 years.
100 years is a "century."
Millennium (1000 years)
18th century
Sixteenth century.
the 19th Century, the 18th Century, the 4th Century BC A century is 100 years
The Century - Century City - was created in 2009.
1873 was the 19th century (1800-1899).
1st century 1-100, 2nd century 101-200, 3rd century 201-300, 4th century 301-400, 5th century 401-500, 6th century 501-600, 7th century 601-700, 8th century 701-800, 9th century 801-900 10th century 901-1000, 11th century 1001-1100, 12th century 1101-1200, 13th century 1201-1300, 14th century 1301-1400, 15th century 1401-1500, 16th century 1501-1600, 17th century 1601-1700, 18th century 1701-1800, 19th century 1801-1900, 20th century 1901-2000, 21st century 2001-2100
The 20th century
We are in the 21st Century.
The century that we are in now- 21st century. :-/
21st century.
1967 was in the 20th century.1st century : 1 - 1002nd century : 101 - 2003rd century : 201 - 300...20th century: 1901 - 2000