Hiding columns based on date

Pretty new to scripts.

I have a sheet with name information in columns A-C and dates from column D on.

I found a script that will hide all columns to the left of the column with the current date.

I would like to modify it to hide all columns to the right of column C, except for the column with the current date.

function onOpen(e) {    var sheet = e.source.getSheetByName('Sheet1'); // or .getSheets()[0]; to apply to the first sheet.    var width = sheet.getDataRange().getWidth();    var dates = sheet.getRange(1, 1, 1, width).getValues().valueOf();      var today = Date.now();    var minDiff = 1e9;    var imin = 0;    for (var i = 0; i < dates[0].length; i++) {      if (Math.abs(dates[0][i]-today) < minDiff) {        imin = i;        minDiff = Math.abs(dates[0][i]-today);      }    }    sheet.hideColumns(1, imin);  }