It seems that virtualbox has a feature to sync the date between guest and host. So, I ran
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VBoxManage setextradata win7 "VBoxInternal/Devices/VMMDev/0/Config/GetHostTimeDisabled" 1
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<ExtraDataItem name="VBoxInternal/Devices/VMMDev/0/Config/GetHostTimeDisabled" value="1"/>
2019-----modified------>2017--------auto_update------->2019