Working clock example using 32K watch crystal

[pedja089]

I spent all night trying to find the best way ... I think this is

              If month=2 then
                 If year//4<>0 then
                    DMonth=29
                 else
                    DMonth=28
                 endif
              else
              Dmonth=30+month.0 
              endif   
              If day>Dmonth then
@                CLRF _Day
@                INCF _Month,F
                 If month>12 then

And everywhere there is any = 0, I replaced the @ clrf, +1 replaced with @ incf.
The end result was the RTC which consumes about 2uA and code size about 500B.