3
Well, with the help of the greek XOOPS community, the problem is solved.
you shall edit the main.php file at //xoops folder/modules/newbb/language/greek/
add the following lines:
define("_MD_TODAY", "\Σ\ή\μ\ε\ρ\α G:i:s");
define("_MD_YESTERDAY", "\Χ\θ\ε\ς G:i:s");
define("_MD_MONTHDAY", "j/n G:i:s");
define("_MD_YEARMONTHDAY", "d/M/Y G:i");
(it says "\s\h\m\e\r\a G:i:s" (meaning \t\o\d\a\y\, xthes....)
......
PS. I can understand the way the search machine works. I've searched with the keywords date problem, and it returned many other things. It does not sort the results by "how close they are of the keywords", it does not rate the results at all i think..