Gracias por tu respuesta!
El archivo html es local esta en el ordenador donde se ejecutaría el script.
Asi serian los archivos html a los que hay que cambiar la hora a la actual pero claro la fecha y hora cambia en cada documento html.
Código HTML:
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<title></title>
</head>
<body>
<div id="si_general">
<h3>General</h3>
<table>
<tr><td class="column1">Motherboard Manufacturer:</td><td class="altvalue">ASRock</td></tr>
<tr><td class="column1">Motherboard Name:</td><td class="altvalue">Z77 Extreme3</td></tr>
<tr><td class="column1">Motherboard Serial Number:</td><td class="altvalue">E80-29006805081</td></tr>
<tr><td class="column1">BIOS Manufacturer:</td><td class="altvalue">American Megatrends Inc.</td></tr>
<tr><td class="column1">BIOS Version:</td><td class="altvalue">P1.10</td></tr>
</table>
</div>
<div id="si_cpu">
<h3>CPU</h3>
<table>
<tr><td class="column1">CPU manufacturer:</td><td class="altvalue">GenuineIntel</td></tr>
<tr><td class="column1">CPU Type:</td><td class="altvalue">Intel(R) Core(TM) i5-3470 CPU @ 3.20GHz</td></tr>
<tr><td class="column1">CPUID</td><td class="altvalue">Family 6, Model 3A, Stepping 9</td></tr>
<tr><td class="column1">Physical CPU's:</td><td class="altvalue">1</td></tr>
<tr><td class="column1">Cores per CPU:</td><td class="altvalue">4</td></tr>
<tr><td class="column1">Hyperthreading:</td><td class="altvalue">Disabled</td></tr>
<tr><td class="column1">CPU features:</td><td class="altvalue">MMX SSE SSE2 SSE3 SSSE3 SSE4.1 SSE4.2 DEP PAE Intel64 VMX SMX AES </td></tr>
<tr><td class="column1">Clock frequencies:</td><td class="altvalue"></td></tr>
<tr><td class="column1">- Measured CPU speed:</td><td class="altvalue">3603.7 MHz</td></tr>
<tr><td class="column1">Cache per CPU package:</td><td class="altvalue"></td></tr>
<tr><td class="column1">- L1 Instruction Cache:</td><td class="altvalue">4 x 32 KB</td></tr>
<tr><td class="column1">- L1 data cache:</td><td class="altvalue">4 x 32 KB</td></tr>
<tr><td class="column1">- L2 cache:</td><td class="altvalue">4 x 256 KB</td></tr>
<tr><td class="column1">- L3 cache:</td><td class="altvalue">6 MB</td></tr>
</table>
</div>
</div>
<div id="si_graphics">
<h3>Graphics</h3>
<table>
<tr><td class="column1">NVIDIA GeForce GTX 750</td><td class="altvalue"></td></tr>
<tr><td class="column1">Chip Type:</td><td class="altvalue">GeForce GTX 750</td></tr>
<tr><td class="column1">DAC Type:</td><td class="altvalue">Integrated RAMDAC</td></tr>
<tr><td class="column1">Memory:</td><td class="altvalue">1024MB</td></tr>
<tr><td class="column1">BIOS:</td><td class="altvalue">Version 82.7.25.0.91</td></tr>
<tr><td class="column1">Driver provider:</td><td class="altvalue">NVIDIA</td></tr>
<tr><td class="column1">Monitor 1:</td><td class="altvalue">1366x768x32 60Hz (Primary monitor) </td></tr>
</table>
</div>
<div id="si_diskvolumes">
<h3>Disk volumes</h3>
<table>
<tr><td class="value">C: Local drive, NTFS, (931.41GB total, 907.35GB free)</td></tr>
<tr><td class="value">D: Optical drive, GSP1RMCULXFREO_ES_DVD, UDF</td></tr>
</table>
</div>
<div id="si_diskdrives">
<h3>Disk drives</h3>
<table>
<tr><td class="value">Unidad de disco: Model ST1000DM003-1CH162 ATA Device (Size: 931.51GB)</td></tr>
</table>
</div>
<div id="si_opticaldrives">
<h3>Optical drives</h3>
<table>
<tr><td class="value">D: TSSTcorp CDDVDW SE-208DB (CD-RW/DVDRW)</td></tr>
</table>
</div>
<div id="si_network">
<h3>Network</h3>
<table>
</table>
</div>
<div id="si_ports">
<h3>Ports</h3>
<table>
<tr><td class="value">Puerto de comunicaciones: COM1 - RS232 Serial Port (max Baud rate: 115200)</td></tr>
</table>
</div>
<div id="si_usb">
<h3>USB</h3>
<table>
<tr><td class="value">Controlador de host de PCI a USB mejorado</td></tr>
<tr><td class="value">Controlador de host de PCI a USB mejorado</td></tr>
<tr><td class="value">- USB Optical Mouse</td></tr>
</table>
</div>
<h2>Result summary</h2>
<table width=640>
<tr><td class="value"><strong>Test Start time</strong></td><td class="altvalue">Tue Mar 11 12:51:54 2014 </td></tr>
<tr>
<td width="40%" class="value"><strong>Test Stop time</strong></td>
<td width="60%" class="altvalue">Tue Mar 11 13:22:01 2014
</td>
</tr>
<tr>
<td width="40%" class="value"><strong>Temperature HDD 0 (ST1000DM003-1CH162 ATA Device) (Max)</strong></td>
<td width="60%" class="altvalue">28.0C</td>
</tr>
<tr>
<td width="40%" class="value"><strong>Temperature GPU 0 (nVIDIA) (Max)</strong></td>
<td width="60%" class="altvalue">53.0C</td>
</tr>
</table>
</body>
</html>
Lo que quiero que se modifique es: Tue Mar 11 12:41:54 2014 y Tue Mar 11 13:22:01 2014 , el primer dato por la fecha y hora actual -40 min y el segundo por la fecha y hora actual.
Saludos