21: Jier
丁辰 – 戊巳
| Iuwen: | 5e fK | 4e fK | 3e fK | 2e fK | 1e fK | 1e iuw | 2e | 3e | 4e | 5e | 6e |
| Jierren: | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 |
 Kalinders | |
| Gregoriaanske kalinder | 21 XXI |
| Ab urbe condita | 774 |
| Etiopyske kalinder | 13 – 14 |
| Hebriuwske kalinder | 3781 – 3782 |
| Hindoekalinders | |
| - Vikram Samvat | 76 – 77 |
| - Kali Yuga | 3122 – 3123 |
Juliaanske kalinder | 21 XXI |
| Sineeske kalinder | 2717 – 2718 |
21 is in gewoan jier dat begjint mei in woansdei. (Juliaanske kalinder foar 21.)
Foarfallen
Berne
Ferstoarn
- Arminius, Germaansk lieder (fermoarde, wierskynlike datum)
- Publius Sulpisius Kwirinius, Romeinsk gûverneur fan Syrje
| Jierren: | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 |
| Iuwen: | 5e fK | 4e fK | 3e fK | 2e fK | 1e fK | 1e iuw | 2e | 3e | 4e | 5e | 6e |
| Boarnen, noaten en/as referinsjes: | ||
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