Try this:
<b>Sheet</b><br /><br /><table border="1" cellspacing="0" style="font-family:Calibri,Arial; font-size:11pt; background-color:#ffffff; "> <colgroup><col style="font-weight:bold; width:30px; " /><col style="width:80px;" /><col style="width:80px;" /><col style="width:103px;" /></colgroup><tr style="background-color:#cacaca; text-align:center; font-weight:bold; font-size:8pt; "><td > </td><td >A</td><td >G</td><td >H</td></tr><tr style="height:18px ;" ><td style="font-size:8pt; background-color:#cacaca; text-align:center; " >1</td><td > </td><td >Militar</td><td >Standard</td></tr><tr style="height:18px ;" ><td style="font-size:8pt; background-color:#cacaca; text-align:center; " >2</td><td > </td><td style="text-align:right; ">327</td><td style="text-align:right; ">03:27:00 a.m.</td></tr><tr style="height:18px ;" ><td style="font-size:8pt; background-color:#cacaca; text-align:center; " >3</td><td > </td><td style="text-align:right; ">1028</td><td style="text-align:right; ">10:28:00 a.m.</td></tr><tr style="height:18px ;" ><td style="font-size:8pt; background-color:#cacaca; text-align:center; " >4</td><td > </td><td style="text-align:right; ">1516</td><td style="text-align:right; ">03:16:00 p.m.</td></tr><tr style="height:18px ;" ><td style="font-size:8pt; background-color:#cacaca; text-align:center; " >5</td><td > </td><td style="text-align:right; ">32115</td><td style="text-align:right; ">03:11:15 a.m.</td></tr><tr style="height:18px ;" ><td style="font-size:8pt; background-color:#cacaca; text-align:center; " >6</td><td > </td><td style="text-align:right; ">131816</td><td style="text-align:right; ">01:18:16 p.m.</td></tr><tr style="height:18px ;" ><td style="font-size:8pt; background-color:#cacaca; text-align:center; " >7</td><td > </td><td style="text-align:right; ">1816451</td><td >It is not an hour</td></tr><tr style="height:18px ;" ><td style="font-size:8pt; background-color:#cacaca; text-align:center; " >8</td><td > </td><td style="text-align:right; ">12</td><td >It is not an hour</td></tr></table><br /><table style="font-family:Arial; font-size:10pt; border-style: groove ;border-color:#00ff00;background-color:#fffcf9; color:#000000; "><tr><td ><b>Formula</b></td></tr><tr><td ><table border = "1" cellspacing="0" cellpadding="2" style="font-family:Arial; font-size:9pt;"><tr style="background-color:#cacaca; font-size:10pt;"><td >Cell</td><td >Formula</td></tr><tr><td >H2</td><td >=IF(LEN(G2)=6,TIMEVALUE(LEFT(G2,2)&":"&MID(G2,3,2)&":"&RIGHT(G2,2)),IF(LEN(G2)=5,TIMEVALUE(LEFT(G2,1)&":"&MID(G2,3,2)&":"&RIGHT(G2,2)),IF(LEN(G2)=4,TIMEVALUE(LEFT(G2,2)&":"&MID(G2,3,2)),IF(LEN(G2)=3,TIMEVALUE(LEFT(G2,1)&":"&MID(G2,2,2)),"It is not an hour"))))</td></tr></table></td></tr></table> <br /><br />