What year is the start of the 20th century
- Which year in the 20th century
- What year is the turn of the 20th century
- What year is the beginning of the 20th century
- What year is the middle of the 20th century
- What year is the end of the 20th century
- What year is the second half of the 20th century
- What year is the first half of the 20th century
- What year is the 20th century bc