Why does my iphone stop working after I change the date and how can I stop it from doing that?

I changed the date to this day 5 years ago so I could extend my spotify premium trial (this actually works) but then me texts weren't sending or receiving same with BBM and Facebook and literally every other social network app and I couldn't connect to the App Store so I changed it back to auto and everything works but I want to stay on my spotify free trial please help

Because it is Apple,
Apple is s**t

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