1821 Nièng
| Chiĕng-gī: | 2 chiĕng-gī |
| Sié-gī: | 18 sié-gī | 19 sié-gī | 20 sié-gī |
| Nièng-dâi: | 1790 nièng-dâi | 1800 nièng-dâi | 1810 nièng-dâi | 1820 nièng-dâi | 1830 nièng-dâi | 1840 nièng-dâi | 1850 nièng-dâi |
| Nièng: | 1816 nièng | 1817 nièng | 1818 nièng | 1819 nièng | 1820 nièng | 1821 nièng | 1822 nièng | 1823 nièng | 1824 nièng | 1825 nièng | 1826 nièng |
| Găng-ciĕ | Gĕng-sìng nièng — gáu — Sĭng-sê̤ṳ nièng |
| Gregorius lĭk | 1821 nièng MDCCCXXI |
| Julius lĭk | bī Gregorius lĭk cā 12 gĕ̤ng |
| Hŭk-lĭk | 2365 nièng |
| Dô̤-gáu-lĭk | 4518 nièng |
| Huòi-lĭk | 1236~1238 |
| Nĭk-buōng Huòng-gī | 2481 nièng |
| Tàng-gī | 4154 nièng |
| Hĭ-báik-lài-lĭk | 5581~5582 |
| Să̤-câung-lĭk | iòng tiék lṳ̀ng (lcags pho 'brug) — gáu — ĭng tiék siè (lcags mo sbrul) |
| Hindu lĭk | |
| - Vikram Samvat | 1876 – 1877 |
| - Shaka Samvat | 1743 – 1744 |
| Iran lĭk | 1199 – 1200 |
| Runic lĭk | 2071 |
| Assyria lĭk | 6571 nièng |
| Ethiopia lĭk | 1815~1816 |
1821 nièng găk Gregorius Lĭk-huák diē-sié sê siŏh ciáh bìng-nièng, tàu gĕ̤ng sê bái-ék; găk Julius Lĭk-huák diē-sié sê siŏh ciáh bìng-nièng, tàu gĕ̤ng sê bái-lĕ̤k. Ciā nièng găk Gregorius Lĭk-huák diē-sié bī Julius Lĭk-huák cā 12 gĕ̤ng. Buô-hông guók-gă găk 1923 nièng ī-sèng gó lā̤ sāi Julius Lĭk-huák.
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