<Tr> <Th> Time Zone </Th> <Th> Standard Time </Th> <Th> Daylight Saving Time </Th> <Th> TZ </Th> </Tr> <Tr> <Td> Atlantic Time Zone </Td> <Td> AST (UTC - 4) </Td> <Td> ADT (UTC - 3) </Td> <Td> AST4ADT </Td> </Tr> <Tr> <Td> Eastern Time Zone </Td> <Td> EST (UTC - 5) </Td> <Td> EDT (UTC - 4) </Td> <Td> EST5EDT </Td> </Tr> <Tr> <Td> Central Time Zone </Td> <Td> CST (UTC - 6) </Td> <Td> CDT (UTC - 5) </Td> <Td> CST6CDT </Td> </Tr>

When does the time change in puerto rico