timestamp microseconds */
 uint32 caplen;  /* number of octets in the following packet */
 uint32 len;     /* original length of packet on the wire */
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				<TD VALIGN=TOP>tv_sec</TD>
				<TD>The date and time when this packet was captured.
					This value is in seconds since January 1, 1970 00:00:00 GMT;
					this is also known as a UN*X time_t. You can use the ANSI C
					<em>time()</em> function from <em>time.h</em> to get this valu