Formats of the date command

Write a format, or click the codes below: the preview shows what date +FORMAT prints, as GNU date does, and the tool gives the command, with the codes that only exist on Linux.

Format
date prints

Settings
Names of days and months:
Command

    
    
    
In a crontab (each % becomes \%)

    

  


  

    
Codes: click to insert

    
Marked GNU: Linux only. Between % and the letter, GNU date also accepts - (no padding), _ (spaces), 0 (zeros), ^ (capitals) and a width: %-d, %_H, %^B, %3N.


      

        
Date

        

          
          
          
          
          
          
          
          
          
        

      

      

        
Time

        

          
          
          
          
          
          
          
          
          
          
        

      

      

        
Names

        

          
          
          
          
          
        

      

      

        
Weeks

        

          
          
          
          
          
          
          
        

      

      

        
Time zone

        

          
          
          
        

      

      

        
Other

        

          
          
          
          
          
          
        

      

  


  

    
Transparency

    
The preview is computed in your browser, by the scripts listed below. Nothing you type leaves this page.

    

      
Enforced by your browser

      
This page's Content Security Policy allows a single destination, the site's audience measurement (connect-src https://stats.r-no.fr, see below), and forbids any form submission (form-action 'none'), so even a bug could not send what you type anywhere. You can read the policy at the top of the page source.
Audience measurement
Like every page of the site, this one counts its visit with Umami, installed on R-no’s own server (stats.r-no.fr). It receives the address of the page, without parameters or anchor, the site you came from (its domain only), your browser, system, language and screen size, and the country, region and city deduced from your IP address, which is not kept. It never receives what you type, nor the result of the tool. No cookie, nothing stored in your browser; if your browser asks not to be tracked (Do Not Track), nothing is measured. The data is erased after 25 months.
  • /commun/mesure.js: the filter applied before each sending, written for R-no Toolbox. 1.4 kB
    SHA-256 225eec74fd12623d82fc05ee7d222be629ce454d081c129e8d1e249ed37ee716
  • https://stats.r-no.fr/m.js: Umami’s tracker, open source (MIT), served by the measurement server. Its fingerprint is not shown here: it changes with each version of Umami, and you cannot check from your browser that it is the published code. For that part, you have to trust R-no.


      
What is stored

      
No cookie, and nothing in the address. What you type is never stored: it disappears when you reload or close the page. Your language is given by the address itself (/en/ or /fr/): nothing is stored to remember it. Like any website, the server records the download of the page and its files in its access logs (IP address, date and time, address requested, browser name). It never receives what you type.


      
Code that runs here

      

        
    
          
  • app.js: the formatting, as GNU date does it, and the commands, written for R-no Toolbox. Not minified, no third-party library. 17.3 kB
    SHA-256 8914166b2564d111bc22da6bfa448aabc0b56a5b99f12b9602380ce9968d0170
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  • textes.js: the French messages of the tool, shown by its script (the rest of the French page is written into its HTML when the site is built). It only defines texts, with no logic. 7.2 kB
    SHA-256 22e76801922a2b98c29a3b1ba34a47416792b34eb0f7e9be35073375b8b9a8af
    • 
          
  • /commun/langue.js: the language helper, the same on every page of the site. It reads the language of the page and gives the tool its messages in that language. It stores nothing. 1.6 kB
    SHA-256 80f76f69773ef628d36d09bf8387cfedebda4529210d7120649b6f5603310631
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Before you paste

      
This page only writes text: it runs nothing, neither here nor on your machine. What you paste into a terminal or a configuration file runs with your rights, so read it first. The code it writes downloads nothing and calls no outside service.


      
How it was checked

      
Every code and flag above was compared with GNU date (coreutils 9, glibc) on 314 moments between 1970 and 2033, in four time zones (UTC, Paris, New York, Kolkata) and in the C and fr_FR locales: 2,512 identical results, including the quirk of ^, which leaves accented letters in lower case (FéVRIER).


      
Check it yourself

      
Download a script and compare its fingerprint with the one above:
curl -s https://r-no.fr/linux/date/app.js | shasum -a 256


      
Limits

      
%Z shows the name your browser gives the time zone (often GMT+2), where the system writes CEST. %N only has millisecond precision here. The French names are those of recent glibc versions; another system may abbreviate differently. On macOS, the codes marked GNU print something else, or nothing.