- Gregorian calendar
- 670 BC, DCLXX BC
- Ancient egypt era
- XXV dynasty , 83
- Pharaoh
- Taharqa , 21
- Ancient greek olympiad summer
- 27th Olympiad , year 3
- Balinese saka calendar
- N/A
- Bengali calendar
- −1263 – −1262
- Buddhist calendar
- −125
- Burmese calendar
- −1307
- Byzantine calendar
- 4839–4840
- Chinese calendar
- 庚戌 年 (Metal Dog ), 2028 or 1821, — to — , 辛亥年 (Metal Pig ), 2029 or 1822
- Coptic calendar
- −953 – −952
- Ethiopian calendar
- −677 – −676