Adds a banner to the top of GP page that shows up for Christmas every year

Timed Christmas Announcement

function jm_xmas_announcement() {
  $xmascta = '<div class="xmas-announcement" style="background:#e6092a;text-align:center;padding:10px;">';
  $xmascta .= '<a href="' . get_page_link(350) . '" style="color:white;text-transform:uppercase;">';
  $xmascta .= '<p style="margin-bottom:0;padding:10px;border:1px solid white;">Now Taking Christmas Orders</p>';
  $xmascta .= '</a>';
  $xmascta .= '</div>';

  $now = time();
  $year = date('Y');
  $promo = strtotime("01 November $year");
  $christmas = strtotime("25 December $year");
  if ( is_front_page() && $now > $promo && $now < $christmas ) {
    echo $xmascta;
  }
}
add_action( 'generate_before_header', 'jm_xmas_announcement' );