function valid=valid_date(year,month,day)
if integer(year,month,day)==2
if leap_year(year)==2
if month>0 && month<12
if month==2
if day>29 || day<1
valid=false;
return
else
valid=true;
return
end
elseif month==1||month==3||month==5||month==7||month==8||...
month==10||month==12
if day>31 || day<1
valid=false;
return
else
valid=true;
return
end
else
if day>30 || day<1
valid=false;
return
else
valid=true;
return
end
end
else
valid=false;
return
end
else
if month>0 && month<12
if month==2
if day>28 || day<1
valid=false;
return
else
valid=true;
return
end
elseif month==1||month==3||month==5||month==7||month==8||...
month==10||month==12
if day>31 || day<1
valid=false;
return
else
valid=true;
return
end
else
if day>30 || day<1
valid=false;
return
else
valid=true;
return
end
end
else
valid=false;
return
end
end
else
valid=false;
return
end
function result1=integer(year,month,day)
if ~isscalar(year) || year<1 || year~=fix(year)||...
~isscalar(month) || month<1 || year~=fix(month)...
~isscalar(day) || day<1 || year~=fix(day)
result1=1;
else
result1=2;
end
function result2=leap_year(year)
if mod(year,400)==0 || (mod(year,4)==0 && mod(year,100)~=0)
result2=1;
else
result2=2;
end
