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is the weeks start on a Tuesday 08-01-1990 the code would be i would like that the last week of every month take 0.

any idea for my new case
thanks in advance.

I don't understand the question. 08-01-1990 was a Monday.

in my first case the first and last week equal 1 for every months, i would like to reverse my first case.
the first and last week for every months eqaul 0, the others weeks take 1.
you understood me.

?

i Know Mr startz this is the short way thanks!..., but i would to understood the logic of the code (long way code) when i chose for example Tuesday 08/01/1990 the first week or other weeks.
the part of code: i hope you understood me. if you have any idea Mr startz or Mr Gareth.
your help will be very useful for me.

This creates a dummy variable equal to 1 whenever the date of an observation is greater than or equal to the date of the 8th day of the month (@datefloor(@date, "month") is the date of the first date of the month, and +7 makes it the 8th.

i see, how can change the code to make last week of every months eqaul 0.

Could you fully specify what you're after?

suppose my first question was in this topic:
create dummy equal 0 for the first and last week for every months, and others weeks equal 1 (week start on a Monday 08-01-1990)
08/01/1990 to 22/01/1990 =1
12/02/1990 to 19/02/1990 =1
12/03/1990 to 19/03/1990 =1
09/04/1990 to 23/04/1990 =1
.
.
.
etc
how can generate dummy?
you understood me now

thanks! for your help :D