I have a function to calculate day number based on three parameters **d,m,y**

this is the function

```
function getDate (){
d=$1
m=$2
y=$3
m=$((m+9)) % 12
y=$((y - m/10))
return $((365*y + y/4 - y/100 + y/400 + (m*306 + 5)/10 + ( d - 1 )))
}
```

Call for example :

```
getDate 01 01 2015
```

The problem is I get always `line 8: fg: no job control`

which is this line `m=$((m+9)) % 12`