Modifications

year = tonumber(d[3])

u = math.floor((year+4495)*365.25)- 241 + day +(month-5)*30 + _if(month>6, 1) + _if(month>9 and year%4==1, 1) - _if(month<5, 1) - _if(month < 4, 1) - _if(month < 2, 1)

end