extjs/classic/theme-neutral/sass/src/form/field/Date.scss

   1 .#{$prefix}form-date-trigger {
   2     @if $enable-font-icons and ($form-date-trigger-glyph != null) {
   3         @include font-icon($form-date-trigger-glyph, $line-height: null);
   4     } @else {
   5         background-image: theme-background-image('form/date-trigger');
   6
   7         @if $include-rtl {
   8             &.#{$prefix}rtl {
   9                 background-image: theme-background-image('form/date-trigger-rtl');
  10             }
  11         }
  12     }
  13 }