840 Nièng
| Chiĕng-gī: | 1 chiĕng-gī |
| Sié-gī: | 8 sié-gī | 9 sié-gī | 10 sié-gī |
| Nièng-dâi: | 810 nièng-dâi | 820 nièng-dâi | 830 nièng-dâi | 840 nièng-dâi | 850 nièng-dâi | 860 nièng-dâi | 870 nièng-dâi |
| Nièng: | 835 nièng | 836 nièng | 837 nièng | 838 nièng | 839 nièng | 840 nièng | 841 nièng | 842 nièng | 843 nièng | 844 nièng | 845 nièng |
| Găng-ciĕ | Gī-ê nièng — gáu — Gĕng-sĭng nièng |
| Gregorius lĭk | 840 nièng DCCCXL |
| Julius lĭk | bī Gregorius lĭk cā 4 gĕ̤ng |
| Hŭk-lĭk | 1384 nièng |
| Dô̤-gáu-lĭk | 3537 nièng |
| Huòi-lĭk | 225~226 |
| Nĭk-buōng Huòng-gī | 1500 nièng |
| Tàng-gī | 3173 nièng |
| Hĭ-báik-lài-lĭk | 4600~4601 |
| Hindu lĭk | |
| - Vikram Samvat | 895 – 896 |
| - Shaka Samvat | 762 – 763 |
| Iran lĭk | 218 – 219 |
| Runic lĭk | 1090 |
| Assyria lĭk | 5590 nièng |
| Ethiopia lĭk | 834~835 |
840 nièng găk Julius Lĭk-huák diē-sié sê siŏh ciáh nông-nièng, tàu gĕ̤ng sê bái-sé.
Duâi dâi
Chók-sié
Guó-sié
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