Select the date of element

[alex]

Help me please
How to  select (<strong> or <b> or ...) the current date, which is at the bottom?
Based on the selected item (::hover ...)
Screenshot:

[EZ]

On seriesHover, find the SVG:text element that contains the category text and make it bold:

seriesHover: function(e) {
  $( "#chart text" ).css("font-weight", "normal");
  $( "#chart text:contains(" + e.category  + ")" ).css("font-weight", "bold");
}

DEMO