到2005底为止 翻译

by the end of 2005

by the end of 2005
until the end of 2005.

at the end of
在...结尾,在....末端

by the end of
到...末

in the end
adv.最后, 终于

to the end
adv.到底, 始终, 到最后

第一二个是介词短语,后可接时间,三四个相当于副词,一般做状语
at the end of强调时间点,而by the end of应该是强调前面的动作刚好做完

根据语境来判断吧

by the end of 2005

by the end of 2005

To the end of 2005