How to check if someone is logged in every day?

pseudo code:

onAppStartOrResume () {
 var days_online = /* Get the Array from any possible Storage*/;
 if( typeof(days_online) === "undefined" || days_online == null) days_online = [];

 if(days_online.indexOf( /*Date of today */) == -1){
  days_online.push(/* Date of today */);
  // save days_online again.
 }
}

Try sth. like this, but keep in mind that when you want it more secure or you give them good bonuses you might want to count it on a server instead of localy like my pseudocode.

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