<Tr> <Td> Canadian Press, UK standard </Td> <Td> Midnight </Td> <Td> Noon </Td> <Td> Midnight </Td> </Tr> <Tr> <Td> Associated Press style </Td> <Td>--</Td> <Td> noon </Td> <Td> midnight </Td> </Tr> <Tr> <Td> NIST </Td> <Td> midnight 12: 01 a.m. </Td> <Td> noon </Td> <Td> midnight 11: 59 p.m. </Td> </Tr> <Tr> <Td> U.S. de facto legal </Td> <Td> 12: 01 a.m. </Td> <Td>--</Td> <Td> 11: 59 p.m. </Td> </Tr>

How many hours from 8 am to 5 pm