When this option is checked you can customize the date and time display of four different areas in the calendar view:

<table style="margin:10px 0px">
<tr>
<td><b>View title:</b></td>
<td>The currently selected date displayed at the very top of each of the month/week/day views.</td>
</tr>
<tr>
<td><b>Day column title:</b></td>
<td>The date displayed at the top of each column that contains the events of a particular day or week day.</td>
</tr>
<tr>
<td><b>Events:</b></td>
<td>The start time for the calendar events that represent past and future builds.</td>
</tr>
<tr>
<td><b>Slots:</b></td>
<td>The times displayed on the time axis on the left in the week and day views.</td>
</tr>
</table>

The date formats can be specified using standard <a href="http://momentjs.com/docs/#/displaying/format/">Moment.js format strings</a>:

<table style="margin:10px 0px">
    <tr>
        <th></th>
        <th style="text-align:left">Token</th>
        <th style="text-align:left">Output</th>
    </tr>
    <tr>
        <td><b>Month</b></td>
        <td>M</td>
        <td>1 2 ... 11 12</td>
    </tr>
    <tr>
        <td></td>
        <td>Mo</td>
        <td>1st 2nd ... 11th 12th</td>
    </tr>
    <tr>
        <td></td>
        <td>MM</td>
        <td>01 02 ... 11 12</td>
    </tr>
    <tr>
        <td></td>
        <td>MMM</td>
        <td>Jan Feb ... Nov Dec</td>
    </tr>
    <tr>
        <td></td>
        <td>MMMM</td>
        <td>January February ... November December</td>
    </tr>
    <tr>
        <td><b>Quarter</b></td>
        <td>Q</td>
        <td>1 2 3 4</td>
    </tr>
    <tr>
        <td></td>
        <td>Qo</td>
        <td>1st 2nd 3rd 4th</td>
    </tr>
    <tr>
        <td><b>Day of Month</b></td>
        <td>D</td>
        <td>1 2 ... 30 31</td>
    </tr>
    <tr>
        <td></td>
        <td>Do</td>
        <td>1st 2nd ... 30th 31st</td>
    </tr>
    <tr>
        <td></td>
        <td>DD</td>
        <td>01 02 ... 30 31</td>
    </tr>
    <tr>
        <td><b>Day of Year</b></td>
        <td>DDD</td>
        <td>1 2 ... 364 365</td>
    </tr>
    <tr>
        <td></td>
        <td>DDDo</td>
        <td>1st 2nd ... 364th 365th</td>
    </tr>
    <tr>
        <td></td>
        <td>DDDD</td>
        <td>001 002 ... 364 365</td>
    </tr>
    <tr>
        <td><b>Day of Week</b></td>
        <td>d</td>
        <td>0 1 ... 5 6</td>
    </tr>
    <tr>
        <td></td>
        <td>do</td>
        <td>0th 1st ... 5th 6th</td>
    </tr>
    <tr>
        <td></td>
        <td>dd</td>
        <td>Su Mo ... Fr Sa</td>
    </tr>
    <tr>
        <td></td>
        <td>ddd</td>
        <td>Sun Mon ... Fri Sat</td>
    </tr>
    <tr>
        <td></td>
        <td>dddd</td>
        <td>Sunday Monday ... Friday Saturday</td>
    </tr>
    <tr>
        <td><b>Day of Week (Locale)</b></td>
        <td>e</td>
        <td>0 1 ... 5 6</td>
    </tr>
    <tr>
        <td><b>Day of Week (ISO)</b></td>
        <td>E</td>
        <td>1 2 ... 6 7</td>
    </tr>
    <tr>
        <td><b>Week of Year</b></td>
        <td>w</td>
        <td>1 2 ... 52 53</td>
    </tr>
    <tr>
        <td></td>
        <td>wo</td>
        <td>1st 2nd ... 52nd 53rd</td>
    </tr>
    <tr>
        <td></td>
        <td>ww</td>
        <td>01 02 ... 52 53</td>
    </tr>
    <tr>
        <td><b>Week of Year (ISO)</b></td>
        <td>W</td>
        <td>1 2 ... 52 53</td>
    </tr>
    <tr>
        <td></td>
        <td>Wo</td>
        <td>1st 2nd ... 52nd 53rd</td>
    </tr>
    <tr>
        <td></td>
        <td>WW</td>
        <td>01 02 ... 52 53</td>
    </tr>
    <tr>
        <td><b>Year</b></td>
        <td>YY</td>
        <td>70 71 ... 29 30</td>
    </tr>
    <tr>
        <td></td>
        <td>YYYY</td>
        <td>1970 1971 ... 2029 2030</td>
    </tr>
    <tr>
        <td></td>
        <td>Y</td>
        <td>1970 1971 ... 9999 +10000 +10001
            <br>
            <b>Note:</b> This complies with the ISO 8601 standard for dates past the year 9999
        </td>
    </tr>
    <tr>
        <td><b>Week Year</b></td>
        <td>gg</td>
        <td>70 71 ... 29 30</td>
    </tr>
    <tr>
        <td></td>
        <td>gggg</td>
        <td>1970 1971 ... 2029 2030</td>
    </tr>
    <tr>
        <td><b>Week Year (ISO)</b></td>
        <td>GG</td>
        <td>70 71 ... 29 30</td>
    </tr>
    <tr>
        <td></td>
        <td>GGGG</td>
        <td>1970 1971 ... 2029 2030</td>
    </tr>
    <tr>
        <td><b>AM/PM</b></td>
        <td>A</td>
        <td>AM PM</td>
    </tr>
    <tr>
        <td></td>
        <td>a</td>
        <td>am pm</td>
    </tr>
    <tr>
        <td><b>Hour</b></td>
        <td>H</td>
        <td>0 1 ... 22 23</td>
    </tr>
    <tr>
        <td></td>
        <td>HH</td>
        <td>00 01 ... 22 23</td>
    </tr>
    <tr>
        <td></td>
        <td>h</td>
        <td>1 2 ... 11 12</td>
    </tr>
    <tr>
        <td></td>
        <td>hh</td>
        <td>01 02 ... 11 12</td>
    </tr>
    <tr>
        <td></td>
        <td>k</td>
        <td>1 2 ... 23 24</td>
    </tr>
    <tr>
        <td></td>
        <td>kk</td>
        <td>01 02 ... 23 24</td>
    </tr>
    <tr>
        <td><b>Minute</b></td>
        <td>m</td>
        <td>0 1 ... 58 59</td>
    </tr>
    <tr>
        <td></td>
        <td>mm</td>
        <td>00 01 ... 58 59</td>
    </tr>
    <tr>
        <td><b>Second</b></td>
        <td>s</td>
        <td>0 1 ... 58 59</td>
    </tr>
    <tr>
        <td></td>
        <td>ss</td>
        <td>00 01 ... 58 59</td>
    </tr>
    <tr>
        <td><b>Fractional Second</b></td>
        <td>S</td>
        <td>0 1 ... 8 9</td>
    </tr>
    <tr>
        <td></td>
        <td>SS</td>
        <td>00 01 ... 98 99</td>
    </tr>
    <tr>
        <td></td>
        <td>SSS</td>
        <td>000 001 ... 998 999</td>
    </tr>
    <tr>
        <td></td>
        <td>SSSS ... SSSSSSSSS</td>
        <td>000[0..] 001[0..] ... 998[0..] 999[0..]</td>
    </tr>
    <tr>
        <td><b>Time Zone</b></td>
        <td>z or zz</td>
        <td>
            EST CST ... MST PST
            <br>
            <b>Note:</b> as of <b>1.6.0</b>, the z/zz format tokens have been deprecated from plain moment objects. <a href="https://github.com/moment/moment/issues/162">Read more about it here.</a>
            However, they <em>do</em> work if you are using a specific time zone with the moment-timezone addon.
        </td>
    </tr>
    <tr>
        <td></td>
        <td>Z</td>
        <td>-07:00 -06:00 ... +06:00 +07:00</td>
    </tr>
    <tr>
        <td></td>
        <td>ZZ</td>
        <td>
            -0700 -0600 ... +0600 +0700
        </td>
    </tr>
    <tr>
        <td><b>Unix Timestamp</b></td>
        <td>X</td>
        <td>1360013296</td>
    </tr>
    <tr>
        <td><b>Unix Millisecond Timestamp</b></td>
        <td>x</td>
        <td>1360013296123</td>
    </tr>
</table>