8 examples of using date commands

date​ ​ command ​​ Used to display and set ​ ​Linux System ​​ Date and time settings on . This tutorial provides an overview of how to use date​ ​ command ​​ stay ​ ​Linux​​ Display and set the date on the system .

Without options Date command

​​date​​ Command without any command options , It displays the current date and time , Including the day of the week , month , year ,h:m:s Time and time zone in format , As shown below .

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        [[email protected] ~]# date
        
Mon May 24 14:50:31 CST 2021
       
       

        
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Display in world standard time

To use UTC（ World standard time ） Display time , Need to add ​​-u​​ Options .

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        [[email protected] ~]# date -u
        
Mon May 24 06:51:21 UTC 2021
       
       

        
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Displays a specific date in string format

have access to ​​--date​​ Option to display a specific date in string format , This does not affect the date and time of the system , Just convert the date format to a string ：

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        [[email protected] ~]# date --date="5/20/2021 13:14"
        
Thu May 20 13:14:00 CST 2021
       
       

        
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Use date Command to check past dates

date The command can also print past dates and times relative to the current date . For example, view 9 What was the date the day before , Please run the command ：

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        [[email protected] ~]# date --date="9 days ago"
        
Sat May 15 14:56:47 CST 2021
       
       

        
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Look at the date three months ago ：

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        [[email protected] ~]# date --date="3 months ago"
        
Wed Feb 24 14:57:29 CST 2021
       
       

        
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Look at the date today two years ago ：

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        [[email protected] ~]# date --date="2 years ago"
        
Fri May 24 15:02:40 CST 2019
       
       

        
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Use date Command to check future dates

date The command can also display future dates , For example, look at tomorrow's date ：

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        [[email protected] ~]# date --date="tomorrow"
        
Tue May 25 14:58:49 CST 2021
       
       

        
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Check the exact date a week from now , Please run ：

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        [[email protected] ~]# date --date="next week"
        
Mon May 31 14:59:27 CST 2021
       
       

        
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Show 3 Date after week ：

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        [[email protected] ~]# date --date="3 weeks"
        
Mon Jun 14 15:00:11 CST 2021
       
       

        
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Show 4 Months later , Do the following ：

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        [[email protected] ~]# date --date="4 months"
        
Fri Sep 24 15:01:42 CST 2021
       
       

        
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Show today's date two years later ：

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        [[email protected] ~]# date --date="2 years"
        
Wed May 24 15:03:32 CST 2023
       
       

        
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date Command options

date The command comes with many options , Face lists some of the available formatting options .

• • 
    
• %D – The date display format is month / Japan / year
• %Y – year ( for example ：2021)
• %m – month (01-12)
• %B – The full name of the month ( for example January)
• %b – Short name of the month ( for example Jan)
• %d – Which day of the month ( for example 01)
• %j – The day of the year (001-366)
• %u – Day of the week (1-7)
• %A – What day of the week ( for example Friday)
• %a – Short name of the day of the week ( for example Fri)
• %H – Hours ,24 hourly (00-23)
• %I – Hours ,12 hourly (01-12)
• %M – minute (00-59)
• %S – second (00-60)
  • 
    

Use date The syntax of options is very simple ：

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        date "+%option"
       
       

        
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for example , To use yy/mm/dd Format print date , Please run ：

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        [[email protected] ~]# date "+%Y/%m/%d"
        
2021/05/24
       
       

        
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What day of the week do you want to print , month , Japan , Year and current time , Do the following ：

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        [[email protected] ~]# date "+%A %B %d %Y %T"
        
Monday May 24 2021 15:24:07
       
       

        
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How to set the date and time

date The command also allows you to set the date and time . for example , To set the date and time to 2021 year 6 month 25 The morning of 11:15, Please run the following command ：

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        [[email protected] ~]# date --set="20210625 11:15"
        
Fri Jun 25 11:15:00 CST 2021
       
       

        
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Use in variables date command

Creating ​ ​Shell​​​ ​ Script ​​ When , We will date Save the command to a variable , Then use this variable to create a log file , An example is shown below ：

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        #!/bin/bash
        
LOGFILE=/tmp/logs-$(date +%d-%m-%Y_%T)
        
echo "##Check Cluster for Failed Resources##"  >> $LOGFILE
        
crm_mon -1 -rf | grep FAILED  >> $LOGFILE
        
echo -e "\n\n" >> $LOGFILE
        
echo "##Check Cluster for Stopped Resources##"  >> $LOGFILE
        
crm_mon -1 -rf | grep -i STOPPED  >> $LOGFILE
        
echo -e "\n\n" >> $LOGFILE
       
       

        
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summary

date Commands are used to display and set Linux Date and time settings on the system . This tutorial provides an overview of how to use date Command in Linux Display and set the date on the system .