<P> The general rule, in years which are leap years in the Julian calendar but not the Gregorian, is as follows: </P> <P> Up to 28 February in the calendar you are converting from add one day less or subtract one day more than the calculated value . Remember to give February the appropriate number of days for the calendar you are converting into . When you are subtracting days to move from Julian to Gregorian be careful, when calculating the Gregorian equivalent of 29 February (Julian), to remember that 29 February is discounted . Thus if the calculated value is − 4 the Gregorian equivalent of this date is 24 February . </P> <Table> <Tr> <Th> Country </Th> <Th> Start numbered year on 1 January </Th> <Th> Adoption of Gregorian calendar </Th> </Tr> <Tr> <Td> Denmark </Td> <Td> Gradual change from 13th to 16th centuries </Td> <Td> 1700 </Td> </Tr> <Tr> <Td> Venice </Td> <Td> 1522 </Td> <Td> 1582 </Td> </Tr> <Tr> <Td> Holy Roman Empire (Catholic states) </Td> <Td> 1544 </Td> <Td> 1583 </Td> </Tr> <Tr> <Td> Spain, Poland, Portugal </Td> <Td> 1556 </Td> <Td> 1582 </Td> </Tr> <Tr> <Td> Holy Roman Empire (Protestant states) </Td> <Td> 1559 </Td> <Td> 1700 </Td> </Tr> <Tr> <Td> Sweden </Td> <Td> 1559 </Td> <Td> 1753 </Td> </Tr> <Tr> <Td> France </Td> <Td> 1564 </Td> <Td> 1582 </Td> </Tr> <Tr> <Td> Southern Netherlands </Td> <Td> 1576 </Td> <Td> 1582 </Td> </Tr> <Tr> <Td> Lorraine </Td> <Td> 1579 </Td> <Td> 1682 </Td> </Tr> <Tr> <Td> Dutch Republic </Td> <Td> 1583 </Td> <Td> 1582 </Td> </Tr> <Tr> <Td> Scotland </Td> <Td> 1600 </Td> <Td> 1752 </Td> </Tr> <Tr> <Td> Russia </Td> <Td> 1700 </Td> <Td> 1918 </Td> </Tr> <Tr> <Td> Tuscany </Td> <Td> 1721 </Td> <Td> 1750 </Td> </Tr> <Tr> <Td> Great Britain and the British Empire except Scotland </Td> <Td> 1752 </Td> <Td> 1752 </Td> </Tr> </Table> <Tr> <Th> Country </Th> <Th> Start numbered year on 1 January </Th> <Th> Adoption of Gregorian calendar </Th> </Tr>

When did the new russian calendar go into effect