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function date.u2p( du )
year = math.ceil((du - 1)/365.25+0.00000001)-4495
day_year = du%1461-365*math.floor((du%1461)/365.25)-_if(year%4==1,1)
month = 1 + _if(day_year>31,1) + _if(day_year>61,1)
+ _if(day_year>184,1) + _if(day_year>215,1) + _if(day_year>245,1)
+ _if(day_year>275,1) + _if(day_year>305 + _if((year%4)==1,1),1) + _if(day_year>335 + _if((year%4)==1,1),1)
day_month = day_year - _if(month>1,31) - _if(month>2,30) - _if(month>3,31) - _if(month>4,31) - _if(month>5,31) - _if(month>6,30) - _if(month>7,31) - _if(month>8,30) - _if(month>9,30) - _if(month>10,30 + _if((year%4)==1,1)) - _if(month>11,30) dt = ""tostring(day)..'/'..tostring(month)..'/'..tostring(year)
return dt
end
