<Table> <Tr> <Th> Calendar </Th> <Th> Today </Th> </Tr> <Tr> <Th> Gregorian </Th> <Td> 13 February 2018 </Td> </Tr> <Tr> <Th> Julian </Th> <Td> 31 January 2018 </Td> </Tr> </Table> <Tr> <Th> Calendar </Th> <Th> Today </Th> </Tr> <Tr> <Th> Gregorian </Th> <Td> 13 February 2018 </Td> </Tr> <Tr> <Th> Julian </Th> <Td> 31 January 2018 </Td> </Tr>

When were june and july added to the calendar