Linux modification time

#Modify time zone
cp /usr/share/zoneinfo/Asia/Shanghai /etc/localtime  

#Modification time < machines that can access the Internet >
yum -y install ntpdate
#Modification time < machines that cannot access the Internet >
date -s "2019-10-15 17:18:56"
#System time synchronization hardware time
hwclock  --systohc
#Hardware time synchronization system time
hwclock  --hctosys

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