If you look at the html that is used for the DateTextBox , you will see that td for the current date looks like this:
<td class="dijitCalendarEnabledDate dijitCalendarCurrentDate dijitCalendarCurrentMonth dijitCalendarDateTemplate" role="gridcell" data-dojo-attach-point="dateCells" aria-selected="false" tabindex="0"> <span class="dijitCalendarDateLabel" data-dojo-attach-point="dateLabels">30</span> </td>
If you want to style the current date so that it looks different, you should update the css selector, for example
.dijitCalendarDateTemplate.dijitCalendarCurrentDate{ background-color: green; }
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