Jh., century, århundred  - die Jahrhundertverwirrung:

 

Deutsch: Jahrhundert / Jh. / Jhdt. - das 20. Jahrhundert umfasst die Jahre von 1901 bis 2000

English: century / c.

According to the Gregorian calendar, the 1st century AD/CE started on January 1, 1 and ended on December 31, 100. The 2nd century started at year 101, the 3rd at 201, etc.

But: There is informally another system used: For example, the years 1900–1999 are sometimes referred to as the nineteen hundreds (1900s)

Dansk, svensk, norsk: århundred / årh.

Århundreder er inddelinger af årstal ordnet i kronologisk fortløbende grupper af hundreder, som f.eks. 1801-1900 (det 19. århundrede).

But: In Swedish, Danish, Norwegian and Finnish, centuries are typically not named ordinall. Swedish nittonhundratalet (or 1900-talet), Danish and Norwegian nittenhundredetallet (or 1900-tallet) reffers to the years 1900–1999.

Det attende, nittende, tyvende århundrede = 1700-, 1800-, 1900-tallet