title: Set starting date of calendar in ngb-datepicker
body: <p>I am working in an application built in angular 7. I need to show a calendar in my application.
  For showing calendar I am using angular ng-bootstrap control - <a href="https://ng-bootstrap.github.io/#/components/datepicker/overview" rel="nofollow noreferrer">ngb-datepicker</a> </p>
  
  <p>Now my requirement is that, I want to set the start date for calendar.
  For example if user goes to any month then,  calendar should start from the date which I provide.</p>
  
  <p>For example for April month I want below view:</p>
  
  <p><a href="https://i.stack.imgur.com/zMMe0.png" rel="nofollow noreferrer">click here to see image</a></p>
  
  <p>Please ignore colors of dates.</p>
  
  <p>Also I want Sunday to be start day of week, for that I am using firstDayOfWeek property.</p>
  
  <p>Code link:</p>
  
  <p><a href="https://stackblitz.com/edit/angular-afaqdh-qjxdut?embed=1&amp;file=app/datepicker-basic.ts" rel="nofollow noreferrer">Click here</a></p>