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Promised, in the future, I will ask questions well explained
Thank you for your advice , and thanks for your response too about code.
Best week-end.

Import just the last date (April, August, December in every year) from my page frequency monthly to undated page.
1998m04
1998m08
1998m12
1999m04
...
2010m12.

i have use this Mr Gareth:

could you help me.

How can solve my case? by @dateadd and @datefloor

if i use series f=@datefloor(@date,"m") it generate all date, inequality is to use just the 1998m04 1998m08 1998m12... in the series, I don't know how.

i have use this: but i get not the date
series f=@date<=@datefloor(@date,"m")+1 or @dateadd(@datefloor(@date,"m"),3,"m")

Emmm , how can import just the last date by four month from my page frequency monthly.

i get this with the code: 30/08/1998, 30/12/1998...., Aug and Dec have 31 days not 30.
how can modifiend this.

When i do a general match merge, my series date will be like this in page undated: 1998-02-15 00:00, 1998-06-16 00:00, 1998-10-16 12:00, 1999-02-15 00:00.... but i need this:

30/04/1998
31/08/1998
31/12/1998
30/04/1999
....
31/12/2010

or 1998m04, 1998m08, 1998m12....

1/ perfect thanks!
2/ for weeks ok!, but for month i get this: 30/08/1998, 30/12/1998, Aug and Dec have 31 days not 30
smpl @first @first
series months = @dateval("30/04/1998")
smpl @first+1 @last
months = @dateadd(months(-1), 4,"m")

I ask this question because EViews can not suport this frequency by four month. 1/i have workfile with two page with monthly frequency 1998m01 2010m12 (156 obs), and undated (156/4)=39 obs, how can generate date by every four month in the page unstructured (30/04/1998, 31/08/1998,....), or by simple...

I thought it was by loop, sorry for the inconvenience.
thanks you Mr Gareth and Mr startz.

Error in Sample: Numeric operator applied to string data in"SMPL IF @DATESTR(@DATE,"M")=1-1". %list = "January February March April May June July August September October November December" !num = @wcount(%list) for !i = 1 to !num smpl if @datestr(@date,"m")=!...

@datestr(x,"m") Than what I put in the place x

error messge Error in Sample: Incorrect number of arguments for @DATESTR function in "SMPL IF @DATESTR=1-1".