Yeah. I once changed my clock forward one year and all my fishes died with an amazing age of 208657! When I tried to undo it by changing the clock back, they are still dead!

i dont do my clock messing anymore i only use it when researching, need a speical fish, or getting a magic fish because i like to see the little guys when they are 6 yrs old espeically the goldbulbs there so cute