.gridForWeekOf(@days) {
  @oneDay: 100% / @days;
  @oneDayIE: 0.9993781095 * @oneDay;
  //magic constant, have no idea from where it comes from

  .generate-day();

  .generate-day(@i:1) when (@i =< @days) {
    .cal-row-fluid .cal-cell@{i} {
      width:  (@i * @oneDay);
      *width: (@i * @oneDayIE);
    }

    .cal-row-fluid .cal-offset@{i},
    .cal-row-fluid .cal-offset@{i}:first-child,
    .cal-week-box .cal-offset@{i} {
      margin-left: (@i * @oneDay);
      *margin-left: (@i * @oneDayIE);
    }
    .generate-day(@i + 1);
  }

}

.gridForWeeks(@i:1) when (@i =< 7) {
  .cal-week-box,
  .cal-month-box
   {
    &.cal-grid-@{i} {
      .gridForWeekOf(@i);
    }
  }

  .gridForWeeks(@i + 1);
}