This definitely works on Tamagotchi Friends (I believe it works on other versions too0.
Step 1. Set your Tamagotchi to one minute before waking up. This is the only way it will work. Set the date to one day after the day you have set.
Step 2. Put it to bed if it isn't asleep before you changed...
I changed the time so now she's 6 and can be married. She fell in love with Spacetchi. They had a girl (will upload photos soon) then changed the time back. And nothing really happened even though it was 10 pm. I also fixed the date. And she connected with her BTFF (Best Tama Friends Forever) I...
The first generation was a boy. The next was a girl. Then boy. Then boy again...and then there was the fifth generation. The fith generation was special. I had raised a Pianitchi. I was happy about the gift I had received...no slip ups or too little slip ups. I will change the time.
Entry 1: Just got fresh batteries in my tama. She evolved into a Petitihanatchi. The purple tama, her buddy, is Pianitichi, a perfect care character and a gourmet type. She is fast asleep.