modules/controls/src/main/java/com/sun/javafx/scene/control/DatePickerContent.java

*** 141,156 ****
  
                  // RT-30903: Make sure width snaps to pixel when divided by
                  // number of columns. GridPane doesn't do this with percentage
                  // width constraints. See GridPane.adjustColumnWidths().
                  final int nCols = daysPerWeek + (datePicker.isShowWeekNumbers() ? 1 : 0);
!                 final double snaphgap = snapSpace(getHgap());
!                 final double left = snapSpace(getInsets().getLeft());
!                 final double right = snapSpace(getInsets().getRight());
                  final double hgaps = snaphgap * (nCols - 1);
                  final double contentWidth = width - left - right - hgaps;
!                 return ((snapSize(contentWidth / nCols)) * nCols) + left + right + hgaps;
              }
  
              @Override protected void layoutChildren() {
                  // Prevent AssertionError in GridPane
                  if (getWidth() > 0 && getHeight() > 0) {
--- 141,156 ----
  
                  // RT-30903: Make sure width snaps to pixel when divided by
                  // number of columns. GridPane doesn't do this with percentage
                  // width constraints. See GridPane.adjustColumnWidths().
                  final int nCols = daysPerWeek + (datePicker.isShowWeekNumbers() ? 1 : 0);
!                 final double snaphgap = snapSpaceX(getHgap());
!                 final double left = snapSpaceX(getInsets().getLeft());
!                 final double right = snapSpaceX(getInsets().getRight());
                  final double hgaps = snaphgap * (nCols - 1);
                  final double contentWidth = width - left - right - hgaps;
!                 return ((snapSizeX(contentWidth / nCols)) * nCols) + left + right + hgaps;
              }
  
              @Override protected void layoutChildren() {
                  // Prevent AssertionError in GridPane
                  if (getWidth() > 0 && getHeight() > 0) {