<b>Excel 2012</b><table cellpadding="2.5px" rules="all" style=";background-color: #FFFFFF;border: 1px solid;border-collapse: collapse; border-color: #BBB"><colgroup><col width="25px" style="background-color: #DAE7F5" /><col /><col /><col /><col /></colgroup><thead><tr style=" background-color: #DAE7F5;text-align: center;color: #161120"><th></th><th>A</th><th>B</th><th>C</th><th>D</th></tr></thead><tbody><tr ><td style="color: #161120;text-align: center;">1</td><td style="color: #574123;background-color: #FFFFFF;;">Date</td><td style="text-align: right;;"></td><td style=";">Month</td><td style=";">Count</td></tr><tr ><td style="color: #161120;text-align: center;">2</td><td style="color: #574123;background-color: #FFFFFF;;">9-Jan</td><td style="text-align: right;;"></td><td style=";">January</td><td style="text-align: right;;">7</td></tr><tr ><td style="color: #161120;text-align: center;">3</td><td style="color: #574123;background-color: #FFFFFF;;">10-Apr</td><td style="text-align: right;;"></td><td style=";">February</td><td style="text-align: right;;">0</td></tr><tr ><td style="color: #161120;text-align: center;">4</td><td style="color: #574123;background-color: #FFFFFF;;">11-Jan</td><td style="text-align: right;;"></td><td style=";">March</td><td style="text-align: right;;">2</td></tr><tr ><td style="color: #161120;text-align: center;">5</td><td style="color: #574123;background-color: #FFFFFF;;">12-Sep</td><td style="text-align: right;;"></td><td style=";">April</td><td style="text-align: right;;">1</td></tr><tr ><td style="color: #161120;text-align: center;">6</td><td style="color: #574123;background-color: #FFFFFF;;">13-Jan</td><td style="text-align: right;;"></td><td style=";">May</td><td style="text-align: right;;">2</td></tr><tr ><td style="color: #161120;text-align: center;">7</td><td style="color: #574123;background-color: #FFFFFF;;">14-Dec</td><td style="text-align: right;;"></td><td style=";">June</td><td style="text-align: right;;">0</td></tr><tr ><td style="color: #161120;text-align: center;">8</td><td style="color: #574123;background-color: #FFFFFF;;">15-May</td><td style="text-align: right;;"></td><td style=";">July</td><td style="text-align: right;;">0</td></tr><tr ><td style="color: #161120;text-align: center;">9</td><td style="color: #574123;background-color: #FFFFFF;;">16-Mar</td><td style="text-align: right;;"></td><td style=";">August</td><td style="text-align: right;;">0</td></tr><tr ><td style="color: #161120;text-align: center;">10</td><td style="color: #574123;background-color: #FFFFFF;;">17-Jan</td><td style="text-align: right;;"></td><td style=";">September</td><td style="text-align: right;;">1</td></tr><tr ><td style="color: #161120;text-align: center;">11</td><td style="color: #574123;background-color: #FFFFFF;;">13-Jan</td><td style="text-align: right;;"></td><td style=";">October</td><td style="text-align: right;;">0</td></tr><tr ><td style="color: #161120;text-align: center;">12</td><td style="color: #574123;background-color: #FFFFFF;;">14-Dec</td><td style="text-align: right;;"></td><td style=";">November</td><td style="text-align: right;;">0</td></tr><tr ><td style="color: #161120;text-align: center;">13</td><td style="color: #574123;background-color: #FFFFFF;;">17-May</td><td style="text-align: right;;"></td><td style=";">December</td><td style="text-align: right;;">3</td></tr><tr ><td style="color: #161120;text-align: center;">14</td><td style="color: #574123;background-color: #FFFFFF;;">16-Mar</td><td style="text-align: right;;"></td><td style="text-align: right;;"></td><td style="text-align: right;;"></td></tr><tr ><td style="color: #161120;text-align: center;">15</td><td style="color: #574123;background-color: #FFFFFF;;">17-Jan</td><td style="text-align: right;;"></td><td style="text-align: right;;"></td><td style="text-align: right;;"></td></tr><tr ><td style="color: #161120;text-align: center;">16</td><td style="color: #574123;background-color: #FFFFFF;;">13-Jan</td><td style="text-align: right;;"></td><td style="text-align: right;;"></td><td style="text-align: right;;"></td></tr><tr ><td style="color: #161120;text-align: center;">17</td><td style="color: #574123;background-color: #FFFFFF;;">14-Dec</td><td style="text-align: right;;"></td><td style="text-align: right;;"></td><td style="text-align: right;;"></td></tr></tbody></table><p style="width:3.6em;font-weight:bold;margin:0;padding:0.2em 0.6em 0.2em 0.5em;border: 1px solid #BBB;border-top:none;text-align: center;background-color: #DAE7F5;color: #161120">Sheet1</p><br /><br /><table width="85%" cellpadding="2.5px" rules="all" style=";border: 2px solid black;border-collapse:collapse;padding: 0.4em;background-color: #FFFFFF" ><tr><td style="padding:6px" ><b>Worksheet Formulas</b><table cellpadding="2.5px" width="100%" rules="all" style="border: 1px solid;text-align:center;background-color: #FFFFFF;border-collapse: collapse; border-color: #BBB"><thead><tr style=" background-color: #DAE7F5;color: #161120"><th width="10px">Cell</th><th style="text-align:left;padding-left:5px;">Formula</th></tr></thead><tbody><tr><th width="10px" style=" background-color: #DAE7F5;color: #161120">D2</th><td style="text-align:left">=SUMPRODUCT(<font color="Blue">--(<font color="Red">A$2:A$100<>""</font>),--(<font color="Red">MONTH(<font color="Green">A$2:A$100</font>)=1</font>)</font>)</td></tr><tr><th width="10px" style=" background-color: #DAE7F5;color: #161120">D3</th><td style="text-align:left">=SUMPRODUCT(<font color="Blue">--(<font color="Red">MONTH(<font color="Green">A$2:A$100</font>)=2</font>)</font>)</td></tr><tr><th width="10px" style=" background-color: #DAE7F5;color: #161120">D4</th><td style="text-align:left">=SUMPRODUCT(<font color="Blue">--(<font color="Red">A$2:A$100<>""</font>),--(<font color="Red">MONTH(<font color="Green">A$2:A$100</font>)=3</font>)</font>)</td></tr><tr><th width="10px" style=" background-color: #DAE7F5;color: #161120">D5</th><td style="text-align:left">=SUMPRODUCT(<font color="Blue">--(<font color="Red">A$2:A$100<>""</font>),--(<font color="Red">MONTH(<font color="Green">A$2:A$100</font>)=4</font>)</font>)</td></tr><tr><th width="10px" style=" background-color: #DAE7F5;color: #161120">D6</th><td style="text-align:left">=SUMPRODUCT(<font color="Blue">--(<font color="Red">A$2:A$100<>""</font>),--(<font color="Red">MONTH(<font color="Green">A$2:A$100</font>)=5</font>)</font>)</td></tr><tr><th width="10px" style=" background-color: #DAE7F5;color: #161120">D7</th><td style="text-align:left">=SUMPRODUCT(<font color="Blue">--(<font color="Red">A$2:A$100<>""</font>),--(<font color="Red">MONTH(<font color="Green">A$2:A$100</font>)=6</font>)</font>)</td></tr><tr><th width="10px" style=" background-color: #DAE7F5;color: #161120">D8</th><td style="text-align:left">=SUMPRODUCT(<font color="Blue">--(<font color="Red">A$2:A$100<>""</font>),--(<font color="Red">MONTH(<font color="Green">A$2:A$100</font>)=7</font>)</font>)</td></tr><tr><th width="10px" style=" background-color: #DAE7F5;color: #161120">D9</th><td style="text-align:left">=SUMPRODUCT(<font color="Blue">--(<font color="Red">A$2:A$100<>""</font>),--(<font color="Red">MONTH(<font color="Green">A$2:A$100</font>)=8</font>)</font>)</td></tr><tr><th width="10px" style=" background-color: #DAE7F5;color: #161120">D10</th><td style="text-align:left">=SUMPRODUCT(<font color="Blue">--(<font color="Red">A$2:A$100<>""</font>),--(<font color="Red">MONTH(<font color="Green">A$2:A$100</font>)=9</font>)</font>)</td></tr><tr><th width="10px" style=" background-color: #DAE7F5;color: #161120">D11</th><td style="text-align:left">=SUMPRODUCT(<font color="Blue">--(<font color="Red">A$2:A$100<>""</font>),--(<font color="Red">MONTH(<font color="Green">A$2:A$100</font>)=10</font>)</font>)</td></tr><tr><th width="10px" style=" background-color: #DAE7F5;color: #161120">D12</th><td style="text-align:left">=SUMPRODUCT(<font color="Blue">--(<font color="Red">A$2:A$100<>""</font>),--(<font color="Red">MONTH(<font color="Green">A$2:A$100</font>)=11</font>)</font>)</td></tr><tr><th width="10px" style=" background-color: #DAE7F5;color: #161120">D13</th><td style="text-align:left">=SUMPRODUCT(<font color="Blue">--(<font color="Red">A$2:A$100<>""</font>),--(<font color="Red">MONTH(<font color="Green">A$2:A$100</font>)=12</font>)</font>)</td></tr></tbody></table></td></tr></table><br />
EDIT: oops, the formula for February should be the same as the rest.