SAP UI5 Calendar - Remove Special date color

<!DOCTYPE HTML>
<html>

<head>
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta http-equiv='Content-Type' content='text/html;charset=UTF-8' />

  <script src="https://sapui5.hana.ondemand.com/resources/sap-ui-core.js" id="sap-ui-bootstrap" data-sap-ui-libs="sap.m" data-sap-ui-resourceroots='{"view": "./"}' data-sap-ui-theme="sap_belize" data-sap-ui-xx-bindingSyntax="complex">
  </script>

  <script>
    // Best practice would be to set this stuff up in an Component.js
    // but let's not over-complicate stuff for demonstration purposes

    sap.ui.localResources("view");  //get access to view folder
    
    var app = new sap.m.App({
      initialPage: "idMain"
    });
    
    var page = sap.ui.view({
      id: "idMain",
      viewName: "view.Main",
      type: sap.ui.core.mvc.ViewType.XML
    });
    
    app.addPage(page);
    app.placeAt("content");
  </script>

</head>

<body class="sapUiBody" role="application">
  <div id="content"></div>
</body>

</html>

# Remove Special date color on click of date
_getSpecialDate() method is used to compare the dates between special date and selected date

sap.ui.controller("view.Main", {
  oFormatYyyymmdd: null,

  onInit: function() {
    this.oFormatYyyymmdd = sap.ui.core.format.DateFormat.getInstance({
      pattern: "yyyy-MM-dd",
      calendarType: sap.ui.core.CalendarType.Gregorian
    });
  },


  onBeforeRendering: function() {

  },


  onAfterRendering: function() {

  },


  onExit: function() {

  },
  
  addDays: function(oDate, nDays){
    var oResultDate = new Date(oDate);  //get copy of input date
    oResultDate.setDate(oResultDate.getDate() + nDays);
    return oResultDate;
  },
  
  onShowSpecialDays: function(oEvent){
    var oCalendar = this.getView().byId("calendar");
    
    oCalendar.addSpecialDate(new sap.ui.unified.DateTypeRange({
      startDate: this.addDays(new Date(), 2),
      type: sap.ui.unified.CalendarDayType.Type03
    }));
    
    oCalendar.addSpecialDate(new sap.ui.unified.DateTypeRange({
      startDate: this.addDays(new Date(), -2),
      type: sap.ui.unified.CalendarDayType.Type03
    }));
    
    oCalendar.addSpecialDate(new sap.ui.unified.DateTypeRange({
      startDate: this.addDays(new Date(), 5),
      type: sap.ui.unified.CalendarDayType.Type03
    }));
  },
  
  /**
   * Event hanlder for calendar Select
   */
  onCalDateSelect: function(oEvent){
    var oCalendar = oEvent.getSource();
    var oSpecialDate = this._getSpecialDate(oCalendar.getSelectedDates()[0]);   //returns special date if the selected date is special date
    oCalendar.removeSpecialDate(oSpecialDate);
  },
  
  /**
   * Check if the given date is special date or not
   * and then return the special date
   * @param [sap.ui.unified.DateRange] oInpDateRange - Selected date, should be of type selected date
   */
  _getSpecialDate: function(oInpDateRange){
    var oCalendar = this.getView().byId("calendar");

    //Step 1: get all special dates in calendar
    var aSpecialDates = oCalendar.getSpecialDates();
    
    //Step 2: Check if this input date is part of any special date.
    // if found then return that special date
    var oReturnSpecialDate;
    
    for(var i in aSpecialDates){
      //We cannot do direct comparision on dates...as Special dates contain time stamps
      //but selected date has no time stamp. (If you are create special date without time stamps....then compare the date object directly)
      // So compare only the date, month and year fields
      var oInpStartDate = oInpDateRange.getStartDate();
      var oSpecialStartDate = aSpecialDates[i].getStartDate();
      if(oInpStartDate.getDate() === oSpecialStartDate.getDate()
        && oInpStartDate.getMonth() === oSpecialStartDate.getMonth()
        && oInpStartDate.getFullYear() === oSpecialStartDate.getFullYear()){
          
          oReturnSpecialDate = aSpecialDates[i];
          break;
        }
    }
    
    return oReturnSpecialDate;
  }

});

<sap.ui.core.mvc:View controllerName="view.Main"
    xmlns="sap.m"
    xmlns:sap.ui.core.mvc="sap.ui.core.mvc"
    xmlns:u="sap.ui.unified">
    <Page title="Unified Calendar Clear">
        <content>
          <VBox>
            <u:Calendar id="calendar" select="onCalDateSelect" legend="legend1" />
            <u:CalendarLegend id="legend1"/>
            <Button text="Show Special Days" press="onShowSpecialDays" />
          </VBox>
        </content>
    </Page>
</sap.ui.core.mvc:View>