<div class="c-calendar">
    <ul class="c-calendar__weekdays">
        <li aria-label="Lunedì">Lun</li>
        <li aria-label="Martedì">Mar</li>
        <li aria-label="Mercoledì">Mer</li>
        <li aria-label="Giovedì">Gio</li>
        <li aria-label="Venerdì">Ven</li>
        <li aria-label="Sabato">Sab</li>
        <li aria-label="Domenica">Dom</li>
    </ul>
    <ul class="c-calendar__day-grid">
        <li class="ghost-day">
            <span>29</span>
        </li>
        <li class="ghost-day">
            <span>30</span>
        </li>
        <li class="ghost-day">
            <span>31</span>
        </li>
        <li class="">
            <span>1</span>
        </li>
        <li class="">
            <span>2</span>
        </li>
        <li class="active-day">
            <a href="#">
                <span>3</span>
            </a>
        </li>
        <li class="">
            <span>4</span>
        </li>
        <li class="active-day">
            <a href="#">
                <span>5</span>
            </a>
        </li>
        <li class="">
            <span>6</span>
        </li>
        <li class="active-day">
            <a href="#">
                <span>7</span>
            </a>
        </li>
        <li class="">
            <span>8</span>
        </li>
        <li class="">
            <span>9</span>
        </li>
        <li class="active-day">
            <a href="#">
                <span>10</span>
            </a>
        </li>
        <li class="">
            <span>11</span>
        </li>
        <li class="active-day">
            <a href="#">
                <span>12</span>
            </a>
        </li>
        <li class="">
            <span>13</span>
        </li>
        <li class="active-day">
            <a href="#">
                <span>14</span>
            </a>
        </li>
        <li class="">
            <span>15</span>
        </li>
        <li class="">
            <span>16</span>
        </li>
        <li class="active-day">
            <a href="#">
                <span>17</span>
            </a>
        </li>
        <li class="">
            <span>18</span>
        </li>
        <li class="active-day">
            <a href="#">
                <span>19</span>
            </a>
        </li>
        <li class="">
            <span>20</span>
        </li>
        <li class="active-day">
            <a href="#">
                <span>21</span>
            </a>
        </li>
        <li class="">
            <span>22</span>
        </li>
        <li class="">
            <span>23</span>
        </li>
        <li class="active-day">
            <a href="#">
                <span>24</span>
            </a>
        </li>
        <li class="">
            <span>25</span>
        </li>
        <li class="active-day">
            <a href="#">
                <span>26</span>
            </a>
        </li>
        <li class="">
            <span>27</span>
        </li>
        <li class="active-day">
            <a href="#">
                <span>28</span>
            </a>
        </li>
        <li class="">
            <span>29</span>
        </li>
        <li class="">
            <span>30</span>
        </li>
        <li class="ghost-day">
            <span>1</span>
        </li>
        <li class="ghost-day">
            <span>2</span>
        </li>
    </ul>
</div>
<div class="c-dialog c-dialog--dayflight js-fr-dialogmodal " id="dialog-dayflight">
    <div class="c-dialog__inner js-fr-dialogmodal-modal" aria-labelledby="dialog-dayflight-title">
        <div role="document">
            <p class="c-dialog__title" id="dialog-dayflight-title">Mercoledì <strong>25 Aprile 2018</strong> Andata BLQ > ATH</p>
            <div class="flightDetail">
                <p class="flightDetail__companyName">Alitalia</p>
                <div class="flightDetail__list">
                    <div class="flightDetail__route">
                        <div class="c-transport-hallmark ">
                            <div class="c-transport-hallmark__item">
                                <div class="c-trait ">
                                    <div class="c-trait__el livery">
                                        <img src="../../images/flights-logos/ryanair.png" class="c-trait__livery_img" alt="Ryanair">
                                    </div>
                                    <div class="c-trait__el company">
                                        <p class="label">Company</p>
                                        <p class="txt"><strong>Ryanair</strong></p>
                                    </div>
                                    <div class="c-trait__el">
                                        <p class="label">Linea/Charter</p>
                                        <p class="txt"><strong>Linea</strong></p>
                                    </div>
                                    <div class="c-trait__el">
                                        <p class="label">Numero volo</p>
                                        <p class="txt"><strong>SLD 504</strong></p>
                                    </div>
                                    <div class="c-trait__el">
                                        <p class="label">Partenza</p>
                                        <p class="txt"><strong>14:40</strong></p>
                                    </div>
                                    <div class="c-trait__el">
                                        <p class="label">Arrivo</p>
                                        <p class="txt"><strong>15:40</strong></p>
                                    </div>
                                    <div class="c-trait__el new">
                                        <span class="c-rounded-label c-rounded-label--grey u-typo-level-1">
                                            <span aria-hidden="true">★</span> <strong>Novità</strong>
                                        </span>
                                    </div>
                                </div>
                            </div>
                        </div>
                    </div>
                    <div class="flightDetail__route">
                        <div class="c-transport-hallmark ">
                            <div class="c-transport-hallmark__item">
                                <div class="c-trait ">
                                    <div class="c-trait__el livery">
                                        <img src="../../images/flights-logos/ryanair.png" class="c-trait__livery_img" alt="Ryanair">
                                    </div>
                                    <div class="c-trait__el company">
                                        <p class="label">Company</p>
                                        <p class="txt"><strong>Ryanair</strong></p>
                                    </div>
                                    <div class="c-trait__el">
                                        <p class="label">Linea/Charter</p>
                                        <p class="txt"><strong>Linea</strong></p>
                                    </div>
                                    <div class="c-trait__el">
                                        <p class="label">Numero volo</p>
                                        <p class="txt"><strong>SLD 504</strong></p>
                                    </div>
                                    <div class="c-trait__el">
                                        <p class="label">Partenza</p>
                                        <p class="txt"><strong>14:40</strong></p>
                                    </div>
                                    <div class="c-trait__el">
                                        <p class="label">Arrivo</p>
                                        <p class="txt"><strong>15:40</strong></p>
                                    </div>
                                    <div class="c-trait__el new">
                                        <span class="c-rounded-label c-rounded-label--grey u-typo-level-1">
                                            <span aria-hidden="true">★</span> <strong>Novità</strong>
                                        </span>
                                    </div>
                                </div>
                            </div>
                        </div>
                    </div>
                    <div class="flightDetail__route">
                        <div class="c-transport-hallmark ">
                            <div class="c-transport-hallmark__item">
                                <div class="c-trait ">
                                    <div class="c-trait__el livery">
                                        <img src="../../images/flights-logos/ryanair.png" class="c-trait__livery_img" alt="Ryanair">
                                    </div>
                                    <div class="c-trait__el company">
                                        <p class="label">Company</p>
                                        <p class="txt"><strong>Ryanair</strong></p>
                                    </div>
                                    <div class="c-trait__el">
                                        <p class="label">Linea/Charter</p>
                                        <p class="txt"><strong>Linea</strong></p>
                                    </div>
                                    <div class="c-trait__el">
                                        <p class="label">Numero volo</p>
                                        <p class="txt"><strong>SLD 504</strong></p>
                                    </div>
                                    <div class="c-trait__el">
                                        <p class="label">Partenza</p>
                                        <p class="txt"><strong>14:40</strong></p>
                                    </div>
                                    <div class="c-trait__el">
                                        <p class="label">Arrivo</p>
                                        <p class="txt"><strong>15:40</strong></p>
                                    </div>
                                    <div class="c-trait__el new">
                                    </div>
                                </div>
                            </div>
                        </div>
                    </div>
                </div>
                <p class="flightDetail__companyName">Ryanair</p>
                <div class="flightDetail__list">
                    <div class="flightDetail__route">
                        <div class="c-transport-hallmark ">
                            <div class="c-transport-hallmark__item">
                                <div class="c-trait ">
                                    <div class="c-trait__el livery">
                                        <img src="../../images/flights-logos/ryanair.png" class="c-trait__livery_img" alt="Ryanair">
                                    </div>
                                    <div class="c-trait__el company">
                                        <p class="label">Company</p>
                                        <p class="txt"><strong>Ryanair</strong></p>
                                    </div>
                                    <div class="c-trait__el">
                                        <p class="label">Linea/Charter</p>
                                        <p class="txt"><strong>Linea</strong></p>
                                    </div>
                                    <div class="c-trait__el">
                                        <p class="label">Numero volo</p>
                                        <p class="txt"><strong>SLD 504</strong></p>
                                    </div>
                                    <div class="c-trait__el">
                                        <p class="label">Partenza</p>
                                        <p class="txt"><strong>14:40</strong></p>
                                    </div>
                                    <div class="c-trait__el">
                                        <p class="label">Arrivo</p>
                                        <p class="txt"><strong>15:40</strong></p>
                                    </div>
                                </div>
                            </div>
                        </div>
                    </div>
                    <div class="flightDetail__route">
                        <div class="c-transport-hallmark ">
                            <div class="c-transport-hallmark__item">
                                <div class="c-trait ">
                                    <div class="c-trait__el livery">
                                        <img src="../../images/flights-logos/ryanair.png" class="c-trait__livery_img" alt="Ryanair">
                                    </div>
                                    <div class="c-trait__el company">
                                        <p class="label">Company</p>
                                        <p class="txt"><strong>Ryanair</strong></p>
                                    </div>
                                    <div class="c-trait__el">
                                        <p class="label">Linea/Charter</p>
                                        <p class="txt"><strong>Linea</strong></p>
                                    </div>
                                    <div class="c-trait__el">
                                        <p class="label">Numero volo</p>
                                        <p class="txt"><strong>SLD 504</strong></p>
                                    </div>
                                    <div class="c-trait__el">
                                        <p class="label">Partenza</p>
                                        <p class="txt"><strong>14:40</strong></p>
                                    </div>
                                    <div class="c-trait__el">
                                        <p class="label">Arrivo</p>
                                        <p class="txt"><strong>15:40</strong></p>
                                    </div>
                                </div>
                            </div>
                        </div>
                    </div>
                    <div class="flightDetail__route">
                        <div class="c-transport-hallmark ">
                            <div class="c-transport-hallmark__item">
                                <div class="c-trait ">
                                    <div class="c-trait__el livery">
                                        <img src="../../images/flights-logos/ryanair.png" class="c-trait__livery_img" alt="Ryanair">
                                    </div>
                                    <div class="c-trait__el company">
                                        <p class="label">Company</p>
                                        <p class="txt"><strong>Ryanair</strong></p>
                                    </div>
                                    <div class="c-trait__el">
                                        <p class="label">Linea/Charter</p>
                                        <p class="txt"><strong>Linea</strong></p>
                                    </div>
                                    <div class="c-trait__el">
                                        <p class="label">Numero volo</p>
                                        <p class="txt"><strong>SLD 504</strong></p>
                                    </div>
                                    <div class="c-trait__el">
                                        <p class="label">Partenza</p>
                                        <p class="txt"><strong>14:40</strong></p>
                                    </div>
                                    <div class="c-trait__el">
                                        <p class="label">Arrivo</p>
                                        <p class="txt"><strong>15:40</strong></p>
                                    </div>
                                </div>
                            </div>
                        </div>
                    </div>
                </div>
            </div>
            <button type="button" class="c-dialog__close js-fr-dialogmodal-close" aria-label="Chiudi la modale">
                <svg class="c-icon c-icon--32">
                    <use xlink:href="#ic_close_black_24px"></use>
                </svg> </button>
        </div>
    </div>
</div>
        
    
        <div class="c-calendar">
  <ul class="c-calendar__weekdays">
    <li aria-label="Lunedì">Lun</li>
    <li aria-label="Martedì">Mar</li>
    <li aria-label="Mercoledì">Mer</li>
    <li aria-label="Giovedì">Gio</li>
    <li aria-label="Venerdì">Ven</li>
    <li aria-label="Sabato">Sab</li>
    <li aria-label="Domenica">Dom</li>
  </ul>
  <ul class="c-calendar__day-grid">
    {{#each days}}
      <li class="{{ this.class }}">
        {{#equalTo this.class "active-day"}}
          <a href="#">
            <span>{{ this.day }}</span>
          </a>
        {{else}}
          <span>{{ this.day }}</span>
        {{/equalTo}}
      </li>
    {{/each}}
  </ul>
    
</div>
{{ render "@dialog--dayflight" }}
    
        
            
            {
  "days": [
    {
      "day": 29,
      "class": "ghost-day"
    },
    {
      "day": 30,
      "class": "ghost-day"
    },
    {
      "day": 31,
      "class": "ghost-day"
    },
    {
      "day": 1
    },
    {
      "day": 2
    },
    {
      "day": 3,
      "class": "active-day"
    },
    {
      "day": 4
    },
    {
      "day": 5,
      "class": "active-day"
    },
    {
      "day": 6
    },
    {
      "day": 7,
      "class": "active-day"
    },
    {
      "day": 8
    },
    {
      "day": 9
    },
    {
      "day": 10,
      "class": "active-day"
    },
    {
      "day": 11
    },
    {
      "day": 12,
      "class": "active-day"
    },
    {
      "day": 13
    },
    {
      "day": 14,
      "class": "active-day"
    },
    {
      "day": 15
    },
    {
      "day": 16
    },
    {
      "day": 17,
      "class": "active-day"
    },
    {
      "day": 18
    },
    {
      "day": 19,
      "class": "active-day"
    },
    {
      "day": 20
    },
    {
      "day": 21,
      "class": "active-day"
    },
    {
      "day": 22
    },
    {
      "day": 23
    },
    {
      "day": 24,
      "class": "active-day"
    },
    {
      "day": 25
    },
    {
      "day": 26,
      "class": "active-day"
    },
    {
      "day": 27
    },
    {
      "day": 28,
      "class": "active-day"
    },
    {
      "day": 29
    },
    {
      "day": 30
    },
    {
      "day": 1,
      "class": "ghost-day"
    },
    {
      "day": 2,
      "class": "ghost-day"
    }
  ]
}
            
        
    
                                .c-calendar__weekdays,
.c-calendar__day-grid {
  display: flex;
  flex-direction: row;
  flex-wrap: wrap;
  @supports (display: grid) {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    grid-gap: 0;
    flex-direction: initial;
    flex-wrap: initial;
  }
  
  li {
    display: flex;
    align-items: center;
    justify-content: center;
    list-style: none;
    margin-left: 0;
    width: 14%; // For flex usage
    flex-grow: 1;
    @supports (display: grid) {
      width: auto;
    }
  }
}
.c-calendar__weekdays {
  margin-bottom: remify(16px);
}
.c-calendar__day-grid {
  background-color: primary(sky, 20);
  border: remify(2px) solid primary(sky, 20);
  @include shadow(medium);
  @supports (display: grid) {
    grid-gap: remify(2px);
  }
  li {
    background-color: secondary(page, 100);
    height: 12vw;
    max-height: remify(125px);
    align-items: flex-start;
    justify-content: flex-start;
    padding: 1vw;
    border: 1px solid primary(sky, 20);
    border-width: 1px 0 0 1px;
    @supports (display: grid) {
      border : none;
    }
  }
  span {
    font-size: 85%;
    line-height: remify(24px);
    @include min-screen(bp(tablet)) {
      font-size: 100%;
    }
  }
  .flight-companies {
    display: flex;
  }
    .company {
      display: none;
      
      @include min-screen(bp(tablet-p)) {
        display: inline-block;
        margin-top: 1vw;
        text-align: center;
      }
    }
  li.ghost-day {
    color: primary(sky, 20);
  }
  li.active-day {
    background-color: #fff;
    padding: 0;
    a {
      padding: 1vw;
      display: block;
      width: 100%;
      height: 100%;
      text-decoration: none;
    }
    span {
      display: block;
      background-color: primary(sky, 120);
      color: #fff;
      font-weight: fw(bold);
      border-radius: remify(20px);
      width: remify(24px);
      height: remify(24px);
      text-align: center;
      @include min-screen(bp(tablet-l)) {
        background-color: transparent;
        color: primary(sky, 120);
        // text-decoration: underline;
      }
    }
  }
}
.c-calendar__hint {
  margin-top: remify(24px);
  display: block;
}
/*------------------------------------*\
  Flights modifier
\*------------------------------------*/
.c-calendar--flights {
  .airports {
    color: primary(night, 80);
    text-align: center;
    margin-bottom: remify(16px);
    font-size: 75%;
    @include min-screen(bp(tablet)) {
      font-size: 100%;
    }
    
    li {
      display: inline-block;
      padding: remify(8px) remify(16px);
    }
    a {
      color: currentColor;
      text-transform: uppercase;
      &.is-active {
        font-weight: fw(bold);
        text-decoration: none;
        color: primary(night, 100);
      }
    }
  }
  .filters {
    margin-bottom: remify(8px);
    @include min-screen(bp(tablet)) {
      display: flex;
      justify-content: space-between;
      flex-wrap: wrap;
      margin-bottom: remify(16px);
    }
  }
  .filters__child {
    @include min-screen(bp(tablet)) {
      flex: 1 1 auto;
    }
  }
  .route {
    @include min-screen(bp(tablet)) {
      order: 1;
    }
    text-align: left;
    .is-label {
      color: primary(night, 100);
      font-weight: fw(bold);
      display: block;
      width: 100%;
      text-align: left;
    }
  }
  .companies {
    display: flex;
    justify-content: center;
    align-items: center;
    
    @include min-screen(bp(tablet)) {
      order: 3;
    }
    label {
      color: primary(night, 100);
      font-weight: fw(bold);
      display: block;
      width: 100%;
      text-align: left;
    }
    i {
      display: block;
      font-weight: fw(regular);
    }
  }
  .news {
    @include min-screen(bp(tablet)) {
      order: 4;
      flex: 1 0 100%;
      text-align: center;
      margin-top: remify(24px);
    }
    label:not(:last-child) {
      margin-right: remify(32px);
    }
  }
  .months {
    display: flex;
    align-items: center;
    justify-content: center;
    @include min-screen(bp(tablet)) {
      order: 2;
    }
    
    p {
      color: primary(night, 100);
      font-size: 150%;
      margin: 0 remify(24px);
    }
    a {
      max-height: remify(24px);
    }
    svg * {
      fill: primary(night, 100);
    }
  }
}
                            
                            
                        If the <li> contains .active-day class, an <a> that opens a dialog is added.
Example:
...
<li class="">
    <span>2</span>
</li>
<li class="active-day">
    <a href="#" class="js-fr-dialogmodal-open" aria-controls="dialog-dayflight">
        <span>3</span>
    </a>
</li>
<li class="">
    <span>4</span>
</li>
...