Yes, but it is in line with the Chicago Manual of Style, which the default stylesheet conforms to. At §15.50 (2017 edition) it gives the following example:

Google. 2016. "Privacy Policy." Privacy & Terms. Last modified March 25, 2016.
http://www.google.com/policies/privacy/.

The same paragraph states: “Chicago requires an access date in citations of websites and other sources consulted online only if no date of publication or revision can be determined from the source”.

But you can modify the stylesheet according to your desiderata if you don't care about following the CMS.

Le Thursday 22 September 2022 à 11:35:32PM, Antonio Piccolboni a écrit :
> Thanks, what I see in my case is that urldate is ignored if either year or
> date field are present. Year or date are mandatory or the key contains the
> letters n.d. I still find seeing the year twice redundant and not consistent
> with how other entry types @book or @article display.
>
> On Thursday, September 22, 2022 at 11:26:11 PM UTC-7 Bastien Dumont wrote:
>
> Here is a sample I got by exporting an item from Zotero and converting the
> CSL JSON file to BibLaTeX via Pandoc:
>
> @online{PageWebSimple,
> author = {Author, First Name},
> title = {Title of the Web Page},
> date = {2000-10-20},
> urldate = {2019-07-20},
> url = {[1]http://placeholder.url}
> }
>
> Le Thursday 22 September 2022 à 03:03:21PM, Antonio Piccolboni a écrit :
> > In what field am I suppose to enter that "June 8, 2021"? I tried year and
> > urldate. The former is repeated twice verbatim, the latter ignored.
> Thanks
> > On Thursday, September 22, 2022 at 1:45:43 PM UTC-7 Bastien Dumont wrote:
> >
> > Or to write a Lua filter, of course!
> >
> > Le Thursday 22 September 2022 à 08:44:17PM, Bastien DUMONT a écrit :
> > > This is because the group ending with a dot contains the author-year
> form
> > of the reference with the year only, whereas the second date is part of
> the
> > full reference and would contain the full date if it were provided. The
> > solution is to provide more information in order to get an output like
> this
> > one:
> > >
> > > Doe, John. 2021. “A DSL That Is Concise and Fun.” Twitter. June 8,
> 2021.
> > [1][2]https://web.archive.org/web/20211216060806/https://twitter.com/
> scalding.
> > >
> > > Le Thursday 22 September 2022 à 12:49:11PM, John MacFarlane a écrit :
> > > > the CSL has
> > > >
> > > > <layout suffix=".">
> > > > <group delimiter=". ">
> > > > <text macro="contributors"/>
> > > > <text macro="date"/>
> > > > <text macro="title"/>
> > > > </group>
> > > > <text macro="description"/>
> > > > <text macro="secondary-contributors" prefix=". "/>
> > > > <text macro="container-title" prefix=". "/>
> > > > <text macro="container-contributors"/>
> > > > <text macro="edition"/>
> > > > <text macro="locators-chapter"/>
> > > > <text macro="collection-title-journal" prefix=", " suffix=", "/>
> > > > <text macro="locators"/>
> > > > <text macro="collection-title" prefix=". "/>
> > > > <text macro="issue"/>
> > > > <text macro="locators-article"/>
> > > > <text macro="access" prefix=". "/>
> > > > </layout>
> > > >
> > > >
> > > > and I think the first date is coming from the "date" macro, while the
> > second is coming from "access," which for web_page uses "issued" date.
> > > >
> > > > I don't know if this is a bug in the style or if there's some
> subtlety
> > that's wrong in pandoc's CSL processing. Maybe a CSL expert can chime in
> > here? Or try using Zotero with chicago-author-date.csl to see what it
> does.
> > > >
> > > > > On Sep 22, 2022, at 12:35 PM, Antonio Piccolboni <
> picc...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
> > wrote:
> > > > >
> > > > > Hi, I am producing pdf and epub from markdown. The bibliography is
> in
> > biblatex. There is a problem with @online items in that the year is
> > repeated twice in the output, be it pdf or epub. This is an entry:
> > > > >
> > > > >
> > > > >
> > > > > @online{scalding,
> > > > > title={A DSL that is concise and fun},
> > > > > url={[2][3]https://web.archive.org/web/20211216060806/https://
> > [4]twitter.com/scalding},
> > > > > year={2021}
> > > > > }
> > > > >
> > > > > And this is the result:
> > > > >
> > > > > “A DSL That Is Concise and Fun.” 2021. 2021. [3]https://
> > [5]web.archive.org/web/20211216060806/https://twitter.com/scalding.
> > > > >
> > > > > I am using the options --citeproc --bibliography biblio.biblatex
> > > > >
> > > > > Other item types look just fine.
> > > > > Any suggestions? Thanks
> > > > >
> > > > >
> > > > > Antonio
> > > > >
> > > > > --
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> > send an email to pandoc-discus...-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org.
> > > > > To view this discussion on the web visit [4][6]https://
> groups.google.com
> > /d/msgid/pandoc-discuss/
> > 826a8e3a-24ed-407d-bc2b-8320ac9a75e0n%[7]40googlegroups.com.
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> > an email to pandoc-discus...-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org.
> > > > To view this discussion on the web visit [5][8]https://
> groups.google.com/d
> > /msgid/pandoc-discuss/B3269C33-2E6B-403C-BC73-4139FC900699%[9]40gmail.com
> .
> > >
> > > --
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> an
> > email to pandoc-discus...-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org.
> > > To view this discussion on the web visit [6][10]https://
> groups.google.com/d/
> > msgid/pandoc-discuss/YyzJIbTFWQuWhF0R%40localhost.
> >
> > --
> > You received this message because you are subscribed to the Google Groups
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> email
> > to [7]pandoc-discus...-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org.
> > To view this discussion on the web visit [8][11]https://groups.google.com
> /d/msgid/
> > pandoc-discuss/6300be55-0355-4427-9e48-730a1656ffc9n%[12]
> 40googlegroups.com.
> >
> > References:
> >
> > [1] [13]https://web.archive.org/web/20211216060806/https://twitter.com/
> scalding
> > [2] [14]https://web.archive.org/web/20211216060806/https://twitter.com/
> scalding
> > [3] [15]https://web.archive.org/web/20211216060806/https://twitter.com/
> scalding
> > [4] [16]https://groups.google.com/d/msgid/pandoc-discuss/
> 826a8e3a-24ed-407d-bc2b-8320ac9a75e0n%40googlegroups.com
> > [5] [17]https://groups.google.com/d/msgid/pandoc-discuss/
> B3269C33-2E6B-403C-BC73-4139FC900699%40gmail.com
> > [6] [18]https://groups.google.com/d/msgid/pandoc-discuss/
> YyzJIbTFWQuWhF0R%40localhost
> > [7] mailto:pandoc-discus...-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org
> > [8] [19]https://groups.google.com/d/msgid/pandoc-discuss/
> 6300be55-0355-4427-9e48-730a1656ffc9n%40googlegroups.com?utm_medium=email&
> utm_source=footer
>
>
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> pandoc-discuss/568b34c1-c26d-4e14-8c7c-6c503d7a34een%40googlegroups.com.
>
> References:
>
> [1] http://placeholder.url/
> [2] https://web.archive.org/web/20211216060806/https://twitter.com/scalding
> [3] https://web.archive.org/web/20211216060806/https://
> [4] http://twitter.com/scalding
> [5] http://web.archive.org/web/20211216060806/https://twitter.com/scalding
> [6] https://groups.google.com/
> [7] http://40googlegroups.com/
> [8] https://groups.google.com/d
> [9] http://40gmail.com/
> [10] https://groups.google.com/d/
> [11] https://groups.google.com/d/msgid/
> [12] http://40googlegroups.com/
> [13] https://web.archive.org/web/20211216060806/https://twitter.com/scalding
> [14] https://web.archive.org/web/20211216060806/https://twitter.com/scalding
> [15] https://web.archive.org/web/20211216060806/https://twitter.com/scalding
> [16] https://groups.google.com/d/msgid/pandoc-discuss/826a8e3a-24ed-407d-bc2b-8320ac9a75e0n%40googlegroups.com
> [17] https://groups.google.com/d/msgid/pandoc-discuss/B3269C33-2E6B-403C-BC73-4139FC900699%40gmail.com
> [18] https://groups.google.com/d/msgid/pandoc-discuss/YyzJIbTFWQuWhF0R%40localhost
> [19] https://groups.google.com/d/msgid/pandoc-discuss/6300be55-0355-4427-9e48-730a1656ffc9n%40googlegroups.com?utm_medium=email&utm_source=footer
> [20] mailto:pandoc-discus...-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org
> [21] https://groups.google.com/d/msgid/pandoc-discuss/568b34c1-c26d-4e14-8c7c-6c503d7a34een%40googlegroups.com?utm_medium=email&utm_source=footer