Why can't I change the current date on my phone?

[AC Question]

I can't change the current date on my phone.

I've looked around a bit on the internet now, but can't find any answers to this.

When I change the ACTUAL date on my phone like from 19th February 2016 to 11th May 2017, the date will be automaticlly set back to 19th Febrary 2016. The same goes with the time.
It is annoying me.

 

[The Questioning Phone Rabbit]

Re: I can't change the current date on my phone.

I am the one who asked the question. I use a Huawei Ascend P7. I am not bad at my phone, but I just can't figure this out.