Hi!

I solved my problem. After see source files of JAVA, I discover that I can use 
":date" in the end of line where the date.issued index was declared.

-          search.index.5 = date:dc.date.issued:date


Doing that, the index is created without "-", for example the metadata 
dc.data.issued='1997-11-12' is indexed like '19971112'. This way I can use the 
option:

-          date:[19790101 TO 19791231] = OK, It returns all items where 
dc.date.issued is like "1979" or "197906" or "19790403" etc



Because the index of date.issued doesn't have "-" anymore.

I hope this help someone.

Manuela Klanovicz Ferreira
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