longitude -180,180 to 0,360

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I have the arrays lat2d(2168,5004) and lon2d(2168,5004).
The longitude values range from -180 to 180.
What's the fastest way to convert this to 0 to 360?

The do loop is too slow:

do ilat=0,2167
   do ilon=0,5003
     if (.not.ismissing(lon2d(ilat,ilon))) then
       if (lon2d(ilat,ilon).lt.0.) then
         lon2d(ilat,ilon)=lon2d(ilat,ilon)+360.
       end if
     end if
   end do
end do

Thanks.

Mike
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