First of all, your computer or server must be connected to the Internet.
under windows
C:> nslookup cn.pool.ntp.org
Use under linux
~] # dig cn.pool.ntp.org
The following picture is under the xshell interface
Choose one of the IPs below
~]# ntpdate 115.28.122.198
After the synchronization is successful, you can write to the scheduled task next.