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DateInterval 怎么减少时间

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Release: 2016-06-13 13:27:53
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DateInterval 如何减少时间
比如这个代码是获取当前时间加上3个小时,那么如何获取减少3个小时呢?

PHP code
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-->(new \DateTime('NOW'))->add(new \DateInterval('PT3H'))
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------解决方案--------------------
DateInterval::format() - Formats the interval
DateTime::add() - Adds an amount of days, months, years, hours, minutes and seconds to a DateTime object
DateTime::sub() - Subtracts an amount of days, months, years, hours, minutes and seconds from a DateTime object
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