421 Nièng
| Chiĕng-gī: | 1 chiĕng-gī |
| Sié-gī: | 4 sié-gī | 5 sié-gī | 6 sié-gī |
| Nièng-dâi: | 390 nièng-dâi | 400 nièng-dâi | 410 nièng-dâi | 420 nièng-dâi | 430 nièng-dâi | 440 nièng-dâi | 450 nièng-dâi |
| Nièng: | 416 nièng | 417 nièng | 418 nièng | 419 nièng | 420 nièng | 421 nièng | 422 nièng | 423 nièng | 424 nièng | 425 nièng | 426 nièng |
| Găng-ciĕ | Gĕng-sĭng nièng — gáu — Sĭng-iū nièng |
| Gregorius lĭk | 421 nièng CDXXI |
| Julius lĭk | bī Gregorius lĭk cā 1 gĕ̤ng |
| Hŭk-lĭk | 965 nièng |
| Dô̤-gáu-lĭk | 3118 nièng |
| Huòi-lĭk | 207 BH~206 BH |
| Nĭk-buōng Huòng-gī | 1081 nièng |
| Tàng-gī | 2754 nièng |
| Hĭ-báik-lài-lĭk | 4181~4182 |
| Hindu lĭk | |
| - Vikram Samvat | 476 – 477 |
| - Shaka Samvat | 343 – 344 |
| Iran lĭk | -201 – -200 |
| Runic lĭk | 671 |
| Assyria lĭk | 5171 nièng |
| Ethiopia lĭk | 415~416 |
421 nièng găk Julius Lĭk-huák diē-sié sê siŏh ciáh bìng-nièng, tàu gĕ̤ng sê bái-lĕ̤k.
Duâi dâi
Chók-sié
Guó-sié
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