Expire is an intransitive verb in this sense. Consequently the sentence should be in the active voice: The contract will expire on 31st July 2009. CB
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Anonymous'... which will be expiring in 30th July 2009'. Is this grammatically wrong?The preposition must be on because the day (30th) is mentioned. The continuous future (will be expiring) is possible. Some people may think that it makes the sentence a little more polite than will expire.