setting the date for testing

From	Michael Grant <mgrant@grant.org>
Newsgroups	linux.debian.user
Subject	setting the date for testing
Date	2020-12-06 21:50 +0100
Message-ID	<Bj98K-6W2-3@gated-at.bofh.it> (permalink)
Organization	linux.* mail to news gateway

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I need to set the date to several years in the future in order to test something.  When I do this via the date command, the date returns back almost instantly (or within a few seconds).

# timedatectl set-time 2025-12-06 20:41:41
# date
Sat  6 Dec 20:41:43 GMT 2025
# date
Sat  6 Dec 20:41:44 GMT 2025
# date
Sun  6 Dec 20:41:48 GMT 2020

I’m not using ntp (that I know of). 

# timedatectl timesync-status
Failed to query server: The name org.freedesktop.timesync1 was not provided by any .service files

# timedatectl show
Timezone=Europe/London
LocalRTC=no
CanNTP=no
NTP=no
NTPSynchronized=no
TimeUSec=Sun 2020-12-06 20:37:19 GMT
RTCTimeUSec=Sun 2020-12-06 18:51:22 GMT

How can I stop (temporarily) the system from automatically setting the date so that I can set it forward?

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setting the date for testing Michael Grant <mgrant@grant.org> - 2020-12-06 21:50 +0100
  Re: setting the date for testing "hdv@gmail" <hdv.jadev@gmail.com> - 2020-12-06 22:00 +0100
  Re: setting the date for testing "hdv@gmail" <hdv.jadev@gmail.com> - 2020-12-07 09:00 +0100
    RE: setting the date for testing Michael Grant <mgrant@grant.org> - 2020-12-13 14:40 +0100
      Re: setting the date for testing "hdv@gmail" <hdv.jadev@gmail.com> - 2020-12-13 15:10 +0100
        Re: setting the date for testing Michael Grant <mgrant@grant.org> - 2020-12-13 16:40 +0100
          Re: setting the date for testing "hdv@gmail" <hdv.jadev@gmail.com> - 2020-12-13 17:00 +0100
  Re: setting the date for testing Michael Stone <mstone@debian.org> - 2020-12-07 15:30 +0100

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