How to Set Date Time from Mac Command Line

By  on  

Working on a web extension that ships to an app store and isn't immediately modifiable, like a website, can be difficult. Since you cannot immediately deploy updates, you sometimes need to bake in hardcoded date-based logic. Testing future dates can be difficult if you don't know how to quickly change the date on your local machine.

To change the current date on your Mac, execute the following from command line:

# Date Format:  MMDDYYYY
sudo date -I 06142024

This command does not modify time, only the current date. Using the same command to reset to current date is easy as well!

Recent Features

  • By
    Send Text Messages with PHP

    Kids these days, I tell ya.  All they care about is the technology.  The video games.  The bottled water.  Oh, and the texting, always the texting.  Back in my day, all we had was...OK, I had all of these things too.  But I still don't get...

  • By
    CSS vs. JS Animation: Which is Faster?

    How is it possible that JavaScript-based animation has secretly always been as fast — or faster — than CSS transitions? And, how is it possible that Adobe and Google consistently release media-rich mobile sites that rival the performance of native apps? This article serves as a point-by-point...

Incredible Demos

  • By
    HTML5 download Attribute

    I tend to get caught up on the JavaScript side of the HTML5 revolution, and can you blame me?  HTML5 gives us awesome "big" stuff like WebSockets, Web Workers, History, Storage and little helpers like the Element classList collection.  There are, however, smaller features in...

  • By
    Animated Progress Bars Using MooTools: dwProgressBar

    I love progress bars. It's important that I know roughly what percentage of a task is complete. I've created a highly customizable MooTools progress bar class that animates to the desired percentage. The Moo-Generated XHTML This DIV structure is extremely simple and can be controlled...


  1. Richard

    I didn’t understand your exact use case, but a helpful way to do date-related testing without modifying your actual computer date/time, is to shim the system calls with library pre-loading. On a Mac, dyld can do this with DYLD_LIBRARY_PATH. On Linux, GNU ld can do it with LD_LIBRARY_PATH.

    This makes it easy to write tests for specific situations, such as monthly changeovers, leap-occurrences, timezones, etc.

    “libfaketime” is a handy library written for this, It’s even packaged in homebrew, just do brew install libfaketime. :)

Wrap your code in <pre class="{language}"></pre> tags, link to a GitHub gist, JSFiddle fiddle, or CodePen pen to embed!