Will Google block ASP generated Last-Modified Header?

The Last-Modified header changes every hour, will google. yahoo block that?

[yanyading]

My web site is organized by ASP files, every web page include a SSI embraced ¡°header.asp¡± which to generate the Last-Modified Header, the source code is the end.

At the bottom of each page, I make a ¡°generated by 14:12:00 CST +0800¡± date mark, that¡¯s all one page often changes. Do you think this solution make the search engines confused / stop visit / or other potential problems to my site?

Thanks!

<!-- -->
<%
dim httpheader_weekday
dim httpheader_month
dim httpheader

select case Weekday(date)
case 1
httpheader_weekday = "Sun, "
case 2
httpheader_weekday = "Mon, "
case 3
httpheader_weekday = "Tue, "
case 4
httpheader_weekday = "Wed, "
case 5
httpheader_weekday = "Thu, "
case 6
httpheader_weekday = "Fri, "
case 7
httpheader_weekday = "Sat, "
end select

select case Month(date)
case 1
httpheader_month = "Jan "
case 2
httpheader_month = "Feb "
case 3
httpheader_month = "Mar "
case 4
httpheader_month = "Apr "
case 5
httpheader_month = "May"
case 6
httpheader_month = "Jun"
case 7
httpheader_month = "Jul"
case 8
httpheader_month = "Aug"
case 9
httpheader_month = "Sep"
case 10
httpheader_month = "Oct"
case 11
httpheader_month = "Nov"
case 12
httpheader_month = "Dec"
end select

httpheader = httpheader_weekday + Cstr(Day(date)) + " " + httpheader_month + " " + " 2005 " + Cstr(Hour(Time)) + ":01:12 +0800 (CST)"

response.AddHeader "Last-Modified", httpheader
SetExpiresHeader(60)
%>
<!-- -->

[yanyading]

SetExpiresHeader(60) SHOULD BE DELETE£¡

[yanyading]

Anyone help me? ~~<^_^L~~