在Grails中，有没有一种好的方法可以使用Joda time模拟当前时间？

now()

dateService

domainInstance.dateService = [ now: { currentTime } ] as DateService

src

// Stop time (and set a particular point in time):
DateTimeUtils.setCurrentMillisFixed(whenever);

// Advance time by the offset:
DateTimeUtils.setCurrentMillisOffset(offsetFromCurrent);

// Restore time (you could do this in an @After method)
DateTimeUtils.setCurrentMillisSystem();

  interface TimeService {
    DateTime getCurrentTime()

    // other time-related methods
  }

  class JodaTimeService implements TimeService {
    DateTime getCurrentTime() {
      new DateTime()
    }  
  }

  class MockTimeService implements TimeService {
    DateTime getCurrentTime() {
      // return a fixed point in time
    }  
  }

import grails.util.Environment

beans = {    
    if (Environment.current == Environment.TEST) {
        timeService(MockTimeService)

    } else {
         timeService(JodaTimeService)
    }
}