- Gregorian calendar
- 680 BC, DCLXXX BC
- Ancient egypt era
- XXV dynasty , 73
- Pharaoh
- Taharqa , 11
- Ancient greek olympiad summer
- 25th Olympiad ( victor )¹
- Balinese saka calendar
- N/A
- Bengali calendar
- −1273 – −1272
- Buddhist calendar
- −135
- Burmese calendar
- −1317
- Byzantine calendar
- 4829–4830
- Chinese calendar
- 庚子 年 (Metal Rat ), 2018 or 1811, — to — , 辛丑年 (Metal Ox ), 2019 or 1812
- Coptic calendar
- −963 – −962
- Ethiopian calendar
- −687 – −686
- Hebrew calendar
- 3081–3082
- Vikram samvat
- −623 – −622
- Shaka samvat
- N/A
- Kali yuga
- 2421–2422
- Iranian calendar
- 1301 BP – 1300 BP
- Islamic calendar
- 1341 BH – 1340 BH