All Calendar weeks in the year 1980 (ISO 8601)
| Calendar week | Monday | Tuesday | Wednesday | Thursday | Friday | Saturday | Sunday |
|---|---|---|---|---|---|---|---|
| 1 | 31. Dec | 1. Jan | 2. Jan | 3. Jan | 4. Jan | 5. Jan | 6. Jan |
| 2 | 7. Jan | 8. Jan | 9. Jan | 10. Jan | 11. Jan | 12. Jan | 13. Jan |
| 3 | 14. Jan | 15. Jan | 16. Jan | 17. Jan | 18. Jan | 19. Jan | 20. Jan |
| 4 | 21. Jan | 22. Jan | 23. Jan | 24. Jan | 25. Jan | 26. Jan | 27. Jan |
| 5 | 28. Jan | 29. Jan | 30. Jan | 31. Jan | 1. Feb | 2. Feb | 3. Feb |
| 6 | 4. Feb | 5. Feb | 6. Feb | 7. Feb | 8. Feb | 9. Feb | 10. Feb |
| 7 | 11. Feb | 12. Feb | 13. Feb | 14. Feb | 15. Feb | 16. Feb | 17. Feb |
| 8 | 18. Feb | 19. Feb | 20. Feb | 21. Feb | 22. Feb | 23. Feb | 24. Feb |
| 9 | 25. Feb | 26. Feb | 27. Feb | 28. Feb | 29. Feb | 1. Mar | 2. Mar |
| 10 | 3. Mar | 4. Mar | 5. Mar | 6. Mar | 7. Mar | 8. Mar | 9. Mar |
| 11 | 10. Mar | 11. Mar | 12. Mar | 13. Mar | 14. Mar | 15. Mar | 16. Mar |
| 12 | 17. Mar | 18. Mar | 19. Mar | 20. Mar | 21. Mar | 22. Mar | 23. Mar |
| 13 | 24. Mar | 25. Mar | 26. Mar | 27. Mar | 28. Mar | 29. Mar | 30. Mar |
| 14 | 31. Mar | 1. Apr | 2. Apr | 3. Apr | 4. Apr | 5. Apr | 6. Apr |
| 15 | 7. Apr | 8. Apr | 9. Apr | 10. Apr | 11. Apr | 12. Apr | 13. Apr |
| 16 | 14. Apr | 15. Apr | 16. Apr | 17. Apr | 18. Apr | 19. Apr | 20. Apr |
| 17 | 21. Apr | 22. Apr | 23. Apr | 24. Apr | 25. Apr | 26. Apr | 27. Apr |
| 18 | 28. Apr | 29. Apr | 30. Apr | 1. May | 2. May | 3. May | 4. May |
| 19 | 5. May | 6. May | 7. May | 8. May | 9. May | 10. May | 11. May |
| 20 | 12. May | 13. May | 14. May | 15. May | 16. May | 17. May | 18. May |
| 21 | 19. May | 20. May | 21. May | 22. May | 23. May | 24. May | 25. May |
| 22 | 26. May | 27. May | 28. May | 29. May | 30. May | 31. May | 1. Jun |
| 23 | 2. Jun | 3. Jun | 4. Jun | 5. Jun | 6. Jun | 7. Jun | 8. Jun |
| 24 | 9. Jun | 10. Jun | 11. Jun | 12. Jun | 13. Jun | 14. Jun | 15. Jun |
| 25 | 16. Jun | 17. Jun | 18. Jun | 19. Jun | 20. Jun | 21. Jun | 22. Jun |
| 26 | 23. Jun | 24. Jun | 25. Jun | 26. Jun | 27. Jun | 28. Jun | 29. Jun |
| 27 | 30. Jun | 1. Jul | 2. Jul | 3. Jul | 4. Jul | 5. Jul | 6. Jul |
| 28 | 7. Jul | 8. Jul | 9. Jul | 10. Jul | 11. Jul | 12. Jul | 13. Jul |
| 29 | 14. Jul | 15. Jul | 16. Jul | 17. Jul | 18. Jul | 19. Jul | 20. Jul |
| 30 | 21. Jul | 22. Jul | 23. Jul | 24. Jul | 25. Jul | 26. Jul | 27. Jul |
| 31 | 28. Jul | 29. Jul | 30. Jul | 31. Jul | 1. Aug | 2. Aug | 3. Aug |
| 32 | 4. Aug | 5. Aug | 6. Aug | 7. Aug | 8. Aug | 9. Aug | 10. Aug |
| 33 | 11. Aug | 12. Aug | 13. Aug | 14. Aug | 15. Aug | 16. Aug | 17. Aug |
| 34 | 18. Aug | 19. Aug | 20. Aug | 21. Aug | 22. Aug | 23. Aug | 24. Aug |
| 35 | 25. Aug | 26. Aug | 27. Aug | 28. Aug | 29. Aug | 30. Aug | 31. Aug |
| 36 | 1. Sep | 2. Sep | 3. Sep | 4. Sep | 5. Sep | 6. Sep | 7. Sep |
| 37 | 8. Sep | 9. Sep | 10. Sep | 11. Sep | 12. Sep | 13. Sep | 14. Sep |
| 38 | 15. Sep | 16. Sep | 17. Sep | 18. Sep | 19. Sep | 20. Sep | 21. Sep |
| 39 | 22. Sep | 23. Sep | 24. Sep | 25. Sep | 26. Sep | 27. Sep | 28. Sep |
| 40 | 29. Sep | 30. Sep | 1. Oct | 2. Oct | 3. Oct | 4. Oct | 5. Oct |
| 41 | 6. Oct | 7. Oct | 8. Oct | 9. Oct | 10. Oct | 11. Oct | 12. Oct |
| 42 | 13. Oct | 14. Oct | 15. Oct | 16. Oct | 17. Oct | 18. Oct | 19. Oct |
| 43 | 20. Oct | 21. Oct | 22. Oct | 23. Oct | 24. Oct | 25. Oct | 26. Oct |
| 44 | 27. Oct | 28. Oct | 29. Oct | 30. Oct | 31. Oct | 1. Nov | 2. Nov |
| 45 | 3. Nov | 4. Nov | 5. Nov | 6. Nov | 7. Nov | 8. Nov | 9. Nov |
| 46 | 10. Nov | 11. Nov | 12. Nov | 13. Nov | 14. Nov | 15. Nov | 16. Nov |
| 47 | 17. Nov | 18. Nov | 19. Nov | 20. Nov | 21. Nov | 22. Nov | 23. Nov |
| 48 | 24. Nov | 25. Nov | 26. Nov | 27. Nov | 28. Nov | 29. Nov | 30. Nov |
| 49 | 1. Dec | 2. Dec | 3. Dec | 4. Dec | 5. Dec | 6. Dec | 7. Dec |
| 50 | 8. Dec | 9. Dec | 10. Dec | 11. Dec | 12. Dec | 13. Dec | 14. Dec |
| 51 | 15. Dec | 16. Dec | 17. Dec | 18. Dec | 19. Dec | 20. Dec | 21. Dec |
| 52 | 22. Dec | 23. Dec | 24. Dec | 25. Dec | 26. Dec | 27. Dec | 28. Dec |