Article From:https://www.cnblogs.com/brainstorm/p/9065304.html

date +“The final output format “-d” designates non current time, there are many ways to default to the current time, but there can be any time in it, but if you can identify, mainly between dates and hours to have space!!!! “

How to use the specific -d, can search shell date -d

Link of this Article: shell date

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