A Derattting Certificate issued on that date is valid for a maximum of six months, or until 14 December 2007.

在该日签发的除鼠证书最长有效期为6个月，即至2007年12月14日前。

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Construct this query iteratively, depending on the search parameters submitted by the user, and restrict it to only those approved listings that are valid for display on the current date.

根据用户提交的搜索参数，使用迭代方式构建查询，并将查询限制到那些可以在当前日期内有效显示的已批准清单。

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The contract shall be valid for 10 years from the effective date of the contract, on the expiry of the validity term of contract, the contract shall automatically become null and void.

本合同有效期从合同生效之日算起共10年，有效期满后，本合同自动失效。

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All tickets for Wednesday's gig will remain valid on the new date, although refunds will be given to fans who are unable to attend.

BBC: Meat Loaf pulls out of Manchester concert

This was a valid comparison on December 31, 1998, the date to which BofA Merrill Lynch has retroactively created its new index.

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The machine is out of order, so he carefully writes in the date by hand, gets on board, and is fined by the conductor for not having a valid ticket.

BBC: Swiss love affair with rail turns sour