blocks|key|615705|text|在不像这样部署NTP的情况下可以这样做：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|615706|sudo+nano+/etc/systemd/timesyncd.conf++|code-block|syntax|javascript|615707|编辑NTP服务器详细信息|615708|[Time]
NTP=ur.ntp.srv
FallbackNTP=ur.fallbackntp.srv|615709|然后|615710|sudo+systemctl+daemon-reload
sudo+timedatectl+set-ntp+off
sudo+timedatectl+set-ntp+on|615711|你可以用|615712|timedatectl+status|entityMap^0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|T|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|U|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|V|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|W|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|X|8|@]|9|@]|A|$]]|$1|M|3|N|5|D|7|Y|8|@]|9|@]|A|$E|F]]|$1|O|3|P|5|6|7|Z|8|@]|9|@]|A|$]]|$1|Q|3|R|5|D|7|10|8|@]|9|@]|A|$E|F]]]|S|$]]

It can be done without deploying NTP like this:

<pre><code>sudo nano /etc/systemd/timesyncd.conf 
</code></pre>

Edit the NTP Server detail

<pre><code>[Time]
NTP=ur.ntp.srv
FallbackNTP=ur.fallbackntp.srv
</code></pre>

Then 

<pre><code>sudo systemctl daemon-reload
sudo timedatectl set-ntp off
sudo timedatectl set-ntp on
</code></pre>

and you can check it with 

<pre><code>timedatectl status
</code></pre>

blocks|key|620961|text|以下几点对我有用：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|620962|timedatectl+set-ntp+true|code-block|syntax|javascript|620963|然后..。|620964|systemctl+restart+systemd-timesyncd|620965|示例：|620966|📷|atomic|offset|length|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://i.stack.imgur.com/enuLa.jpg|imageAlt^0|0|0|0|0|0|0|1|0^^$0|@$1|2|3|4|5|6|7|Z|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|10|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|11|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|12|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|13|8|@]|9|@]|A|$]]|$1|M|3|N|5|O|7|14|8|@]|9|@$P|15|Q|16|1|17]]|A|$]]]|R|$S|$5|T|U|V|A|$W|X|Y|-4]]]]

The following worked for me:

<pre><code>timedatectl set-ntp true
</code></pre>

and then...

<pre><code>systemctl restart systemd-timesyncd
</code></pre>

Example:

<a href="https://i.stack.imgur.com/enuLa.jpg" rel="noreferrer"><img src="https://i.stack.imgur.com/enuLa.jpg" alt="enter image description here"></a>

blocks|key|621146|text|对于那些在AWS+18%2B实例上使用Ubuntu+18%2B的人来说，我发现这非常有效。它利用AWS的内部时间同步服务：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|621147|sudo+apt+install+chrony
sudo+nano+/etc/chrony/chrony.conf|code-block|syntax|javascript|621148|在任何其他服务器条目之前添加以下行：|621149|server+169.254.169.123+prefer+iburst+minpoll+4+maxpoll+4|621150|然后|621151|sudo+/etc/init.d/chrony+restart|621152|对于EC2实例，这种方法最好的部分是，您不必修改安全组规则，即使您的实例没有连接到Internet+:)|621153|来源|offset|length|entityMap|0|LINK|mutability|MUTABLE|url|https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/set-time.html#configure-amazon-time-service-ubuntu^0|0|0|0|0|0|0|0|0|2|0^^$0|@$1|2|3|4|5|6|7|11|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|12|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|13|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|14|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|15|8|@]|9|@]|A|$]]|$1|M|3|N|5|D|7|16|8|@]|9|@]|A|$E|F]]|$1|O|3|P|5|6|7|17|8|@]|9|@]|A|$]]|$1|Q|3|R|5|6|7|18|8|@]|9|@$S|19|T|1A|1|1B]]|A|$]]]|U|$V|$5|W|X|Y|A|$Z|10]]]]

For those using Ubuntu 18+ on AWS EC2 instances, I found this worked fantastically. It utilizes AWS' internal time sync service:
<pre><code>sudo apt install chrony
sudo nano /etc/chrony/chrony.conf
</code></pre>
Add the following line before any other server entry:
<pre><code>server 169.254.169.123 prefer iburst minpoll 4 maxpoll 4
</code></pre>
and then
<pre><code>sudo /etc/init.d/chrony restart
</code></pre>
The best part about this method for EC2 instances is that you don't have to modify your security group rules, even if your instance is not connected to the Internet :)
<a href="https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/set-time.html#configure-amazon-time-service-ubuntu" rel="noreferrer">Source</a>

blocks|key|621046|text|一个与此不完全相关的案例，但我想把它添加到某个地方：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|621047|和我一样，这个timedatectl输出可能对应于防火墙阻塞的NTP端口。|offset|length|style|CODE|621048|在Ubuntu上，可以通过运行以下命令显式地允许在123的NTP端口上进行通信：|621049|sudo+ufw+allow+out+from+any+to+any+port+123|code-block|syntax|javascript|621050|这将允许使用任何端口/网络协议组合从运行在PC上的服务到运行在远程计算机上的服务与任何网络协议一起使用端口123的出站通信。这包括在实现网络时间协议的远程机器上运行的服务，这是能够从远程机器请求时间所必需的。|entityMap^0|0|7|B|0|0|0^^$0|@$1|2|3|4|5|6|7|R|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|S|8|@$D|T|E|U|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|V|8|@]|9|@]|A|$]]|$1|J|3|K|5|L|7|W|8|@]|9|@]|A|$M|N]]|$1|O|3|P|5|6|7|X|8|@]|9|@]|A|$]]]|Q|$]]

A related case that isn't exactly this one but I want to add it somewhere:

It is possible, as was the case for me, for this <code>timedatectl</code> output to correspond to the NTP port being blocked by your firewall.

On Ubuntu, you can explicitly allow communications on the NTP port of 123 by running the following command:

<pre><code>sudo ufw allow out from any to any port 123
</code></pre>

This will allow outbound traffic from a service running on your PC using any port/network-protocol combination to services running on a remote machine using port 123 with any network protocol. This includes services running on remote machines that implement the network time protocol, which is required for being able to ask for the time from a remote machine.

blocks|key|615738|text|Gui选项:转到“设置”->“详细信息”->“日期和时间”->打开“自动日期和时间”。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|615739|systemctl+restart+systemd-timesyncd也许能帮上忙|offset|length|style|CODE|entityMap^0|0|0|Z^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|J|8|@$D|K|E|L|F|G]]|9|@]|A|$]]]|H|$]]

Gui Option:
Go to "Settings" --> "Details" --> "Date &amp; Time" --> Turn on "Automatic Date and Time".

<code>systemctl restart systemd-timesyncd</code> might help

blocks|key|616020|text|我在某个地方读到，要使同步工作，您的系统时间必须在同步服务器时间之外的1000秒以内。如果您当前的系统时间是超过1000秒，它将无法工作。因此，首先尝试手动更改时间：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|616021|timedatectl+set-ntp+false
timedatectl+set-timezone+'Europe/Berlin'
timedatectl+set-time+2022-01-13
timedatectl+set-time+13:16
timedatectl+set-ntp+true|code-block|syntax|javascript|616022|这样做之后，我在timedatectl中得到了“是”。|616023|+++++++++++++++Local+time:+Thu+2022-01-13+13:16:16+CET
+++++++++++Universal+time:+Thu+2022-01-13+12:16:16+UTC
+++++++++++++++++RTC+time:+n/a++++++++++++++++++++++++
++++++++++++++++Time+zone:+Europe/Berlin+(CET,+%2B0100)+
System+clock+synchronized:+yes++#+<-----------+it's+synced++++++++++++++++++++++++
++++++++++++++NTP+service:+active+++++++++++++++++++++
++++++++++RTC+in+local+TZ:+no+++|616024|有关更多信息，请参见此处的-g选项https://linux.die.net/man/8/ntpd|offset|length|style|CODE|entityMap|0|LINK|mutability|MUTABLE|url|https://linux.die.net/man/8/ntpd^0|0|0|0|0|D|2|H|W|0^^$0|@$1|2|3|4|5|6|7|X|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|Y|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Z|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|10|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|11|8|@$M|12|N|13|O|P]]|9|@$M|14|N|15|1|16]]|A|$]]]|Q|$R|$5|S|T|U|A|$V|W]]]]

I read somewhere that you have to have your system time maximum 1000 seconds off the sync-server time for the sync to work. If your current system time is more than 1000s off it will not work.
So try to change the time manually first:
<pre><code>timedatectl set-ntp false
timedatectl set-timezone 'Europe/Berlin'
timedatectl set-time 2022-01-13
timedatectl set-time 13:16
timedatectl set-ntp true
</code></pre>
after doing so i got the &quot;yes&quot; in timedatectl
<pre><code> Local time: Thu 2022-01-13 13:16:16 CET
 Universal time: Thu 2022-01-13 12:16:16 UTC
 RTC time: n/a 
 Time zone: Europe/Berlin (CET, +0100) 
System clock synchronized: yes # &lt;----------- it's synced 
 NTP service: active 
 RTC in local TZ: no 
</code></pre>
For more information see the <code>-g</code> option here <a href="https://linux.die.net/man/8/ntpd" rel="nofollow noreferrer">https://linux.die.net/man/8/ntpd</a>

blocks|key|621179|text|对于那些跟踪最大值's+回答但失败的人。转到NTP，选择特定的池区，并在/etc/systemd/timesyncd.conf中添加至少两个池区。例如，对于亚洲，添加：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|621180|[Time]
NTP=0.asia.pool.ntp.org+1.asia.pool.ntp.org
FallbackNTP=0.pool.ntp.org+1.pool.ntp.org|code-block|syntax|javascript|621181|然后运行推荐答案中的其余命令。|entityMap|0|LINK|mutability|MUTABLE|url|https://askubuntu.com/users/569808/max-robbertze|1|https://askubuntu.com/a/1106011/1150885|2|https://www.pool.ntp.org/^0|10|R|6|3|0|C|2|1|M|3|2|0|0^^$0|@$1|2|3|4|5|6|7|X|8|@$9|Y|A|Z|B|C]]|D|@$9|10|A|11|1|12]|$9|13|A|14|1|15]|$9|16|A|17|1|18]]|E|$]]|$1|F|3|G|5|H|7|19|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|1A|8|@]|D|@]|E|$]]]|M|$N|$5|O|P|Q|E|$R|S]]|T|$5|O|P|Q|E|$R|U]]|V|$5|O|P|Q|E|$R|W]]]]

For those who followed <a href="https://askubuntu.com/users/569808/max-robbertze">max</a>'s <a href="https://askubuntu.com/a/1106011/1150885">answer</a>, but failed.
Go to <a href="https://www.pool.ntp.org/" rel="nofollow noreferrer">NTP</a>, choose your specific pool zone, and add at least two pool zones to your <code>/etc/systemd/timesyncd.conf</code>. For instance, for Asia, add:
<pre><code>[Time]
NTP=0.asia.pool.ntp.org 1.asia.pool.ntp.org
FallbackNTP=0.pool.ntp.org 1.pool.ntp.org
</code></pre>
Then run the rest of the commands in the recommended answer.

'timedatectl' is giving following output -

<pre><code> Local time: Wed 2018-06-13 18:08:51 IST
 Universal time: Wed 2018-06-13 12:38:51 UTC
 RTC time: Wed 2018-06-13 12:38:51
 Time zone: Asia/Kolkata (IST, +0530)
 System clock synchronized: no
systemd-timesyncd.service active: yes
 RTC in local TZ: no
</code></pre>

How to set System clock synchronized to yes?

Enable System clock synchronization

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

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“‘timedatectl”给出了以下输出-                      Local time: Wed 2018-06-13 18:08:51 IST                  Universal time: Wed 2018-06-13 12:38:51 UTC                        RTC time: Wed 2018-06-13 12:38:5

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