Adding date to loop

[Alfa318]

I'm using EViews 11 to run the following simple code for a sample of 173 firms:

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vector(173) myvec for !i=1 to 173 smpl if c_id=!i myvec(!i) = @cor(ret,ret(-1)) next

I have a daily data file, how can I run the above loop for every month separately? I don't know how to introduce date restrictions in the loop. Many thanks.

[EViews Gareth]

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for !i=1 to 12 smpl if @month=!i next

[Alfa318]

Thanks a lot!