Automation of Exchange server Patching

Just got one more question and then I can complete this bit of work and post it here. I need to get the last modified date from an Invoke-WebRequest
$response = Invoke-WebRequest -uri http://xxxxxxx
and if I look at $response I get the following output
"PS C:\Windows\system32> $response1


StatusCode : 200
StatusDescription : OK
Content : ÿþ< ! D O C T Y P E h t m l P U B L I C
" - / / W 3 C / / D T D X H T M L 1 . 0
S t r i c t / / E N " " h t t p : / / w w w . w 3 . o r g / T
R / x h t m l 1 / D T D / x h t m l 1 - s ...
RawContent : HTTP/1.1 200 OK
Accept-Ranges: bytes
Content-Length: 2414
Content-Type: text/html
Date: Thu, 04 Nov 2021 16:55:02 GMT
ETag: "40fb6e89bd1d71:0"
Last-Modified: Thu, 04 Nov 2021 16:49:17 GMT
Serve...
Forms : {}
Headers : {[Accept-Ranges, bytes], [Content-Length, 2414], [Content-Type,
text/html], [Date, Thu, 04 Nov 2021 16:55:02 GMT]...}
Images : {}
InputFields : {}
Links : {}
ParsedHtml : System.__ComObject
RawContentLength : 2414"

What I need is to get the Last-Modified date and check that this is todays date but cannot find a way to do this?