Expression has changed after it was checked. Previous value: '01/26/2015'. Current value: '12/27/2014'

Question

I am getting the error on the below html template:

<p *ngIf="startDate()"><span [innerHTML]="startDate()"></span> to 
        <span [innerHTML]="endDate()"></span></p>

Below is my startDate fn

startDate = () => {
  if (this.session.history[0]) {
      return this.session.history[0].date;
   } else {
      return "";
  }
};

I looked into some threads, but not able to understand the problem or solution. Angular2 - Expression has changed after it was checked - Binding to div width with resize events

Ths solution says we need to use ngAfterViewInit() here, but i am not really getting it.