linux View the current system time, modification time, and file time

linux View the current system time, modification time, view file time, etc.
1. View the time and date
Command: "date"
2. Set the time and date
For example: command to set the system date to June 8, 2018
: "date -s 06/08/2018"
The command to set the system time to
10:46:03 PM Command: "date -s 10:46:03"

3. View the time zone: date -R 

4. Query the current date of the system: $ date + "%Y-%m-%d"  

Note: The plus sign must have a space with date, and no space with %Y, and must be enclosed in double quotation marks; also pay attention to the case. Uppercase Y is the year, lowercase m is the month, and the uppercase M is the minute. Lowercase d for days.

5. Query the current time of the system: $ date +"%H-%M-%S"

Note: Capital S for seconds

6. View the file time (ls -l or ll)

When viewing files under Linux, ls -l does not display seconds by default:

To display seconds (actually more precise), you can use the --full-time parameter:

To display more information, use the stat command:

If there is something wrong, please correct me, learn from each other, and make progress together. 

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