About USA's Public Holiday Calendar
US federal holidays are set by Congress and directly bind only federal employees, banks, and postal service; private employers decide independently which days count as paid time off, so the everyday sense of "is it a holiday" can vary by workplace.
When a holiday falls on a weekend, the federal calendar shifts it to an "observed" weekday — in 2026, Independence Day (July 4) falls on a Saturday, so it is officially observed on Friday, July 3.