Hello, Try
<b>Excel 2007</b><table cellpadding="2.5px" rules="all" style=";background-color: #FFFFFF;border: 1px solid;border-collapse: collapse; border-color: #A6AAB6"><colgroup><col width="25px" style="background-color: #E0E0F0" /><col /><col /></colgroup><thead><tr style=" background-color: #E0E0F0;text-align: center;color: #161120"><th></th><th>L</th><th>M</th></tr></thead><tbody><tr ><td style="color: #161120;text-align: center;">1</td><td style=";">Total Days</td><td style="text-align: right;;">14</td></tr><tr ><td style="color: #161120;text-align: center;">2</td><td style="text-align: right;;"></td><td style="text-align: right;;"></td></tr><tr ><td style="color: #161120;text-align: center;">3</td><td style="text-align: right;;">Fri, April 29, 2011</td><td style="text-align: right;;">938</td></tr><tr ><td style="color: #161120;text-align: center;">4</td><td style="text-align: right;;">Thu, April 28, 2011</td><td style="text-align: right;;">582</td></tr><tr ><td style="color: #161120;text-align: center;">5</td><td style="text-align: right;;">Wed, April 27, 2011</td><td style="text-align: right;;">536</td></tr><tr ><td style="color: #161120;text-align: center;">6</td><td style="text-align: right;;">Tue, April 26, 2011</td><td style="text-align: right;;">343</td></tr><tr ><td style="color: #161120;text-align: center;">7</td><td style="text-align: right;;">Mon, April 25, 2011</td><td style="text-align: right;;">25</td></tr><tr ><td style="color: #161120;text-align: center;">8</td><td style="text-align: right;;">Sun, April 24, 2011</td><td style="text-align: right;;">289</td></tr><tr ><td style="color: #161120;text-align: center;">9</td><td style="text-align: right;;">Sat, April 23, 2011</td><td style="text-align: right;;">738</td></tr><tr ><td style="color: #161120;text-align: center;">10</td><td style="text-align: right;;">Fri, April 22, 2011</td><td style="text-align: right;;">154</td></tr><tr ><td style="color: #161120;text-align: center;">11</td><td style="text-align: right;;">Thu, April 21, 2011</td><td style="text-align: right;;">942</td></tr><tr ><td style="color: #161120;text-align: center;">12</td><td style="text-align: right;;">Wed, April 20, 2011</td><td style="text-align: right;;">367</td></tr><tr ><td style="color: #161120;text-align: center;">13</td><td style="text-align: right;;">Tue, April 19, 2011</td><td style="text-align: right;;">507</td></tr><tr ><td style="color: #161120;text-align: center;">14</td><td style="text-align: right;;">Mon, April 18, 2011</td><td style="text-align: right;;">173</td></tr><tr ><td style="color: #161120;text-align: center;">15</td><td style="text-align: right;;">Sun, April 17, 2011</td><td style="text-align: right;;">816</td></tr><tr ><td style="color: #161120;text-align: center;">16</td><td style="text-align: right;;">Sat, April 16, 2011</td><td style="text-align: right;;">653</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 #A6AAB6;border-top:none;text-align: center;background-color: #E0E0F0;color: #161120">Sheet3</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: #A6AAB6"><thead><tr style=" background-color: #E0E0F0;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: #E0E0F0;color: #161120">M1</th><td style="text-align:left">=COUNT(<font color="Blue">C:C</font>)*7</td></tr><tr><th width="10px" style=" background-color: #E0E0F0;color: #161120">L3</th><td style="text-align:left">=MAX(<font color="Blue">C:C</font>)</td></tr><tr><th width="10px" style=" background-color: #E0E0F0;color: #161120">M3</th><td style="text-align:left">=IF(<font color="Blue">N(<font color="Red">L3</font>),INDEX(<font color="Red">$D:$J,MATCH(<font color="Green">L3,$C:$C,-1</font>),MATCH(<font color="Green">TEXT(<font color="Purple">L3,"ddd"</font>),$D$2:$J$2,0</font>)</font>),""</font>)</td></tr><tr><th width="10px" style=" background-color: #E0E0F0;color: #161120">L4</th><td style="text-align:left">=IF(<font color="Blue">ROWS(<font color="Red">L$3:L3</font>)+1<=$M$1,L3-1,""</font>)</td></tr></tbody></table></td></tr></table><br />
Copy L4 & M3 formulas.
If the dates in C:C are in ascending order change,
MATCH(L3,$C:$C,-1)
to,
MATCH(L3,$C:$C,1)
-1 to 1