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class DateTimeUtil {
    static def timeLine = {
        def subMinute = delegate.upint(Calendar.instance.timeInMillis.minus(it.time),1000 * 60)
        def oneHour = 60
        def oneDay = oneHour * 24
        def oneWeek = oneDay * 7
        def oneMonth = oneDay * 30
        def oneYear = oneDay * 365
        def inhour = 0..<oneHour
        def inday = oneHour..<oneDay
        def inweek = oneDay..<oneWeek
        def inmonth = oneWeek..<oneMonth
        def inyear = oneMonth..<oneYear
        def outyear = oneYear..< Integer.MAX_VALUE

        switch (subMinute) {
            case inhour:
                "${subMinute}分钟前"
                break
            case inday:
                "${subMinute.intdiv(oneHour)}小时前"
                break
            case inweek:
                "${subMinute.intdiv(oneDay)}天前"
                break
            case inmonth:
                "${subMinute.intdiv(oneWeek)}周前"
                break
            case inyear:
                "${subMinute.intdiv(oneMonth)}月前"
                break
            case outyear:
                "${subMinute.intdiv(oneYear)}年前"
                break
            default:
                "E=mc2"
        }


    }

    static def upint = { A,B ->
        /**
        向上取整算法
        http://hi.baidu.com/chinakite/blog/item/3d02f01f339ac3f1e1fe0bc0.html
        UP(A/B) = int( (A+B-1)/B )
        */
        A>0?A.plus(B).minus(1).intdiv(B).toInteger():1
    }

    static void main(args) {
        println Calendar.instance.timeInMillis
        println new Date().time

        println timeLine(new Date(108,6,1))
        println timeLine(new Date(110,7,1))
        println timeLine(new Date(111,3,5,15))
        println timeLine(new Date(111,8))
        println timeLine(new Date(111,8,22,22))
        println timeLine(new Date(111,9,15,24))
        println timeLine(new Date(111,17,19,44))


    }
}

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