Clock Changes in Shanghai, Puerto Rico

Daylight Saving Time (DST) Not Observed in Year 2024

Puerto Rico currently observes Atlantic Standard Time (AST) all year.

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

DST data from before 1970 is not available for Shanghai, Puerto Rico. However, we have earlier DST history for San Juan, Puerto Rico available.

Which countries & states use DST and which do not?