How to use the date command in linux to obtain the time of yesterday or tomorrow

The date command can get the current time. man shows that many parameters of date can be used, which is easy to format.

For example:

Copy codeThe code is as follows:
Date + "% F"
Output Format: 2011-12-31

Date + "% F % H: % M: % S"
Output Format: 2011-12-31 16:29:50

This is to print the current time of the system. if you want to obtain a time relative to the current time, you can use the-d parameter. For example:

Copy codeThe code is as follows:
Date-d "tomorrow" + "% F % H: % M: % S"
Output the time at this time tomorrow

Date-d "yesterday" + "% F % H: % M: % S"
Output the time at this time yesterday

If I want to get the time of 13 days ago, the-d parameter has more flexible usage, for example:

Copy codeThe code is as follows:
Date-d "-1 day ago" + "% F % H: % M: % S"
Output the time at this time tomorrow

Date-d "1 day ago" + "% F % H: % M: % S"
Output the time at this time yesterday

Date-d "1 week ago" + "% F % H: % M: % S"
Output the time seven days ago, which is equivalent
Date-d "7 day ago" + "% F % H: % M: % S"

We can see that ago is powerful. The first number can be a negative number, and the negative number indicates the future time. the positive number indicates the past time, the second parameter is minute, hour, day, month, and week.