No, still backwards. Time is not causal to change. Time is a result of change. Moreover, light is only a constant in a vacuum. Light travels at variable speeds dependent on medium. Time is the measurable result of duration of physical change from start to finish. The constant speed of light over a distance yields a constant measurable duration of time, after the light reaches its destination and distance and duration can be measured. But the speed of light traveling through water slows down and affects the time of duration of travel over a distance. Time https://en.wikipedia.org/wiki/Time Conclusion: Time can only travel forward in time as it always is an additive result of duration.