OK, new approach here. Caution: I don't have a system upgraded to Lion (my computer came with Lion installed) so I can't test this. Untested code; back up before trying this code!!!.

1. Create a new Workflow in Automator.

2. Set the workflow to accept files or folders from the Finder

3. Have the workflow run an AppleScript.

OK, new approach here. Caution: I don't have a system upgraded to Lion (my computer came with Lion installed) so I can't test this. Untested code; back up before trying this code!

1. Create a new Workflow in Automator.

2. Set the workflow to accept files or folders from the Finder by adding the “Ask for Finder items” action.

3. Have the workflow run an AppleScript by adding the “Run AppleScript” action.

on run {input, parameters}
    do shell script "/usr/sbin/systemsetup -setusingnetworktime Off"
    tell application "Finder"
        repeat with x in input
            set myfile to POSIX path of x
            set nm to name of x
            set d to modification date of x
            set yr to (character 3 of (year of d as string)) & (character 4 of (year of d as string))
            set mth to (month of d as number) as string
            if length of mth is 1 then set mth to "0" & mth
            set dy to day of d as string
            if length of dy is 1 then set dy to "0" & dy
            set h to hours of d as string
            if length of h is 1 then set h to "0" & h
            set m to minutes of d as string
            if length of m is 1 then set m to "0" & m
            set s to seconds of d as string
            if length of s is 1 then set s to "0" & s
            set dt to mth & ":" & dy & ":" & yr as string
            set tm to h & ":" & m & ":" & s as string
            do shell script "/usr/sbin/systemsetup -setdate '" & dt & "'"
            do shell script "/usr/sbin/systemsetup -settime ''" & tm & "'"
            do shell script "mv \"" & myfile & "\" /var/tmp/clobber"
            do shell script "mv /var/tmp/clobber \"" & myfile & "\""
        end repeat
    end tell
    do shell script "/usr/sbin/systemsetup -setusingnetworktime On"
    return input
end run

on run {input, parameters}
    do shell script "sudo /usr/sbin/systemsetup -setusingnetworktime Off" with administrator privileges
    tell application "Finder"
        repeat with x in input
            set myfile to POSIX path of x
            set nm to name of x
            set d to modification date of x
            set yr to (character 3 of (year of d as string)) & (character 4 of (year of d as string))
            set mth to (month of d as number) as string
            if length of mth is 1 then set mth to "0" & mth
            set dy to day of d as string
            if length of dy is 1 then set dy to "0" & dy
            set h to hours of d as string
            if length of h is 1 then set h to "0" & h
            set m to minutes of d as string
            if length of m is 1 then set m to "0" & m
            set s to seconds of d as string
            if length of s is 1 then set s to "0" & s
            set dt to mth & ":" & dy & ":" & yr as string
            set tm to h & ":" & m & ":" & s as string
            do shell script "sudo /usr/sbin/systemsetup -setdate '" & dt & "'" with administrator privileges
            do shell script "sudo /usr/sbin/systemsetup -settime '" & tm & "'" with administrator privileges
            do shell script "mv \"" & myfile & "\" /var/tmp/clobber"
            do shell script "mv /var/tmp/clobber \"" & myfile & "\""
        end repeat
    end tell
    do shell script "sudo /usr/sbin/systemsetup -setusingnetworktime On" with administrator privileges
    return input
end run