Clock Changes in Tucson Business Park, Arizona, USA

Daylight Saving Time (DST) Not Observed in Year 2024

USA currently observes 7 time zones all year.

Daylight Saving Time has not been used since our records start, in 1970.

DST data from before 1970 is not available for Tucson Business Park, USA. However, we have earlier DST history for Phoenix, USA available.

Which countries & states use DST and which do not?