退税服务有严格的时间要求，首先，客户消费日期与离境日期间隔不得超过3个月；
Tax shall not be refundable upon over 3 months difference between purchase date and departure date, or over 6 months difference between purchase date and refund date.
利用同样的方法，我们还可以自动计算譬如日期间隔，数值平均，字符串拼接等实现丰富多样的功能。
With the same method, date interval, average value, string merging can be calculated automatically and other various functions can be implemented.
本周早些时候，英国电影院线曾表明不会放映《爱丽丝漫游仙境》，因为迪士尼公司希望将本片在英国的上映期与DVD发布日期间隔三个月以取代原本的十七周。
The chain said earlier this week they would not screen Alice in Wonderland because Disney wanted the gap between their cinema and DVD releases to be around three months instead of the usual 17 weeks.
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