Flag for USA

Clock Changes in Tucson, Arizona, USA 2019

No DST

1970 - 2030

No further time changes in 2019 in Tucson
Location of TucsonLocation

Daylight Saving Time (DST) Not Observed in Year 2019

USA observed Mountain Standard Time (MST) 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, USA. However, we have earlier DST history for Phoenix, USA available.

Which countries & states use DST and which do not?