Datetime Condition In 'where' - International Problem

I use datetime condition in sql-query. For example:

select something from sometable
where date between '06/15/04 00:00:00' and '06/15/04 23:59:59'

and result on two synchronized servers is different.

In USA server result contains where date equal '06/14/04' only,
but Russian server gives where date equal '06/15/04'.

I read mysql online book article 'Writing International Transact-SQL Statements'
and not found any recommendations how solve this problem.

Thanks for any help.