Ghost/ghost/admin/public/assets/icons/calendar-stroke.svg

<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24">
  <title>calendar-stroke</title>
  <defs>
    <style>
      .a{fill:none;stroke:currentColor;stroke-linecap:round;stroke-linejoin:round;stroke-width:1.5px}
    </style>
  </defs>
  <rect class="a" x=".752" y="3.75" width="22.5" height="19.5" rx="1.5" ry="1.5"/>
  <path class="a" d="M.752 9.75h22.5M6.752 6V.75M17.252 6V.75"/>
</svg>