The <a href="https://en.wikipedia.org/wiki/United_States_Congress" id="mwaw" rel="mw:WikiLink" title="United States Congress">US Congress</a> <a href="https://en.wikipedia.org/wiki/Standard_Time_Act" id="mwbA" rel="mw:WikiLink" title="Standard Time Act">establishes</a> <a href="https://en.wikipedia.org/wiki/Time_zone" id="mwbQ" rel="mw:WikiLink" title="Time zone">time zones</a> and approves <a href="https://en.wikipedia.org/wiki/Daylight_saving_time" id="mwbg" rel="mw:WikiLink" title="Daylight saving time">daylight saving time</a>.