| Time Zone | Standard Offset | Apr-Oct | Oct-Apr |
|---|---|---|---|
| US Eastern Standard/Daylight Time | +5 hours | +6 hours | +5 hours |
| US Central Standard/Daylight Time | +4 hours | +5 hours | +4 hours |
| US Mountain Standard/Daylight Time | +3 hours | +4 hours | +3 hours |
| US Pacific Standard/Daylight Time | +2 hours | +3 hours | +2 hours |
| Arizona (always MST) | +3 hours | +3 hours | +3 hours |