程式碼如下：

// 當天前後x天的時間，value負數表示x天前，正數表示x天后
    fun getDay(value: Int): Timestamp {
        val cal = Calendar.getInstance()
        cal.add(Calendar.DAY_OF_MONTH, value)
        return Timestamp(cal.timeInMillis)
    }

    // 某個時間x分鐘前後的時間，value負數表示x分鐘前，正數表示x分鐘後
    fun getMinute(currentTime: Timestamp, value: Int): Timestamp {
        val cal = Calendar.getInstance()
        cal.time = currentTime
        cal.add(Calendar.MINUTE, value)
        return Timestamp(cal.timeInMillis)
    }

    // 當天某小時初始時間,value表示某小時
    fun getHourStart(value: Int): Timestamp {
        val cal = Calendar.getInstance()
        cal.set(Calendar.HOUR_OF_DAY, value)
        cal.set(Calendar.SECOND, 0)
        cal.set(Calendar.MINUTE, 0)
        cal.set(Calendar.MILLISECOND, 0)
        return Timestamp(cal.timeInMillis)
    }

    // 當天某小時結束時間,value表示某小時
    fun getHourEnd(value: Int): Timestamp {
        val cal = Calendar.getInstance()
        cal.set(Calendar.HOUR_OF_DAY, value)
        cal.set(Calendar.SECOND, 59)
        cal.set(Calendar.MINUTE, 59)
        cal.set(Calendar.MILLISECOND, 999)
        return Timestamp(cal.timeInMillis)
    }

    // 週一時間 value: 0表示本週，1表示下週，-1表示上週
    fun getWeekStartTime(value: Int): Timestamp {
        val cal = Calendar.getInstance()
        val weekday = cal.get(Calendar.DAY_OF_WEEK) - value * 7
        cal.add(Calendar.DATE, 2 - weekday)
        return Timestamp(cal.timeInMillis)
    }

    // 週日時間 value: 0表示本週，1表示下週，-1表示上週
    fun getWeekEndTime(value: Int): Timestamp {
        val cal = Calendar.getInstance()
        val weekday = cal.get(Calendar.DAY_OF_WEEK) - value * 7
        cal.add(Calendar.DATE, 8 - weekday)
        return Timestamp(cal.timeInMillis)
    }

    // 月第一天時間 value: 0表示本月，1表示下月，-1表示上月
    fun getMonthStartTime(value: Int): Timestamp {
        val cal = Calendar.getInstance()
        cal.add(Calendar.MONTH, value);
        cal.set(Calendar.DAY_OF_MONTH, cal.getActualMinimum(Calendar.DAY_OF_MONTH))
        return Timestamp(cal.timeInMillis)
    }

    // 月最後一天時間 value: 0表示本月，1表示下月，-1表示上月
    fun getMonthEndTime(value: Int): Timestamp {
        val cal = Calendar.getInstance()
        cal.add(Calendar.MONTH, value);
        cal.set(Calendar.DAY_OF_MONTH, cal.getActualMaximum(Calendar.DAY_OF_MONTH))
        return Timestamp(cal.timeInMillis)
    }

    // 季度第一天時間 value: 0表示本季度，1表示下季度，-1表示上季度
    fun getQuarterStartTime(value: Int): Timestamp {
        val cal = Calendar.getInstance()
        val currentMonth = cal.get(Calendar.MONTH) + 1 + value * 3
        //只計算到去年第四季度或明年第一季度
        val month: Int = if (currentMonth < 1) 9 else if (currentMonth in 1..3) 0 else if (currentMonth in 4..6) 3 else if (currentMonth in 7..9) 6 else if (currentMonth in 10..12) 9 else 0
        if (currentMonth < 1) cal.add(Calendar.YEAR, -1) else if (currentMonth > 12) cal.add(Calendar.YEAR, 1) else {
        }
        cal.set(Calendar.MONTH, month)
        cal.set(Calendar.DATE, 1)
        return Timestamp(cal.timeInMillis)
    }

    // 季度最後一天時間 value: 0表示本季度，1表示下季度，-1表示上季度
    fun getQuarterEndTime(value: Int): Timestamp {
        val cal = Calendar.getInstance()
        val currentMonth = cal.get(Calendar.MONTH) + 1 + value * 3
        //只計算到去年第四季度或明年第一季度
        val month: Int = if (currentMonth < 1) 11 else if (currentMonth in 1..3) 2 else if (currentMonth in 4..6) 5 else if (currentMonth in 7..9) 8 else if (currentMonth in 10..12) 11 else 2
        val day: Int = if (currentMonth < 1) 31 else if (currentMonth in 1..3) 31 else if (currentMonth in 4..6) 30 else if (currentMonth in 7..9) 30 else if (currentMonth in 10..12) 31 else 31
        if (currentMonth < 1) cal.add(Calendar.YEAR, -1) else if (currentMonth > 12) cal.add(Calendar.YEAR, 1) else {
        }
        cal.set(Calendar.MONTH, month)
        cal.set(Calendar.DATE, day)
        return Timestamp(cal.timeInMillis)
    }

    //年度第一天時間 value: 0表示今年，1表示明年，-1表示去年
    fun getYearStartTime(value: Int): Timestamp {
        val cal = Calendar.getInstance()
        cal.add(Calendar.YEAR, value);
        cal.set(Calendar.MONTH, 0)
        cal.set(Calendar.DATE, 1)
        return Timestamp(cal.timeInMillis)
    }

    //年度最後一天時間 value: 0表示今年，1表示明年，-1表示去年
    fun getYearEndTime(value: Int): Timestamp {
        val cal = Calendar.getInstance()
        cal.add(Calendar.YEAR, value);
        cal.set(Calendar.MONTH, 11)
        cal.set(Calendar.DATE, 31)
        return Timestamp(cal.timeInMillis)
    }
 

部分自測的結果

@Test
    fun testDate(){
        val value = 4
        val ds = commUtil.getHourStart(0)
        val de = commUtil.getHourEnd(23)
        val dd = commUtil.getHourStart(8)
        val ws = commUtil.getWeekStartTime(-38)
        val we = commUtil.getWeekEndTime(-38)
        val ms = commUtil.getMonthStartTime(value)
        val me = commUtil.getMonthEndTime(value)
        val qs = commUtil.getQuarterStartTime(-5)
        val qe = commUtil.getQuarterEndTime(-5)
        val ys = commUtil.getYearStartTime(value)
        val ye = commUtil.getYearEndTime(value)
        log.info(">>>天：$ds>>>$de>>>$dd>>>周：$ws>>>$we>>>月：$ms>>>$me>>>季：$qs>>>$qe>>>年：$ys>>>$ye")
    }
 

當天0點，當天24點，當天8點，38周前週一，38周前週日，四個月後月初，四個月後月末，去年第四季度起始，去年第四季度結束，四年年初，四年年末

>>>天：2018-09-19 00:00:00.0>>>2018-09-19 23:59:59.999>>>2018-09-19 08:00:00.0>>>周：2017-12-25 11:29:01.449>>>2017-12-31 11:29:01.449>>>月：2019-01-01 11:29:01.449>>>2019-01-31 11:29:01.449>>>季：2017-10-01 11:29:01.449>>>2017-12-31 11:29:01.449>>>年：2022-01-01 11:29:01.449>>>2022-12-31 11:29:01.449