<Tr> <Th> 1944 </Th> <Td> </Td> <Td> </Td> <Td> War Time all year Arizona War Time not observed Sat January 1 02: 00--Sat April 1 02: 00 Arizona War Time ends Sat September 30 02: 00 </Td> </Tr> <Tr> <Th> 1943 </Th> <Td> </Td> <Td> </Td> <Td> War Time all year </Td> </Tr> <Tr> <Th> 1942 </Th> <Td> Mon February 9 02: 00 </Td> <Td> </Td> <Td> War Time begins year round </Td> </Tr> <Tr> <Th> 1920--41 </Th> <Td> </Td> <Td> </Td> <Td> Local decision, various dates </Td> </Tr>

When was daylight savings time started in the us