Mountain Time
Tuesday 21 December 2021, week 51
| Los Angeles | −1 hours | −1 hours |
| Chicago | +1 hours | |
| New York | +2 hours | |
| Toronto | +2 hours | |
| São Paulo | +4 hours | |
| London | +7 hours | |
| UTC | +7 hours | |
| Lagos | +8 hours | |
| Paris | +8 hours | |
| Zurich | +8 hours | |
| Cairo | +9 hours | |
| Johannesburg | +9 hours | |
| Istanbul | +10 hours | |
| Moscow | +10 hours | |
| Dubai | +11 hours | |
| Mumbai | +12.5 hours | |
| Hong Kong | +15 hours | |
| Shanghai | +15 hours | |
| Singapore | +15 hours | |
| Tokyo | +16 hours | |
| Sydney | +18 hours |