• 0

Need Help: JS array to change a word every 90 days

Asked by Brandon H,

 Share

Question

Grand Master

Brandon H Supervisor

Posted
  • Supervisor
Posted

Hello

 

I'm working on a JavaScript array with several words in it and I want it to cycle to the next word every 90 days (or every 3 months if easier).

 

Say I have an array like the following

  

var word = ['test1', 'test2', 'test3', 'test4'];

 

I'd like to do it by date string so I already have a set of variables setup to show date in the following format:

YYYYMMDD

20171213

 

Any help would be appreciated, I am a bit new to JavaScript and Java in general.

 

edit: current code 

<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>JavaScript Word Testing</title>
<script>
var word = ['test1', 'test2', 'test3', 'test4'];
var d = new Date();
var day = dom(d);
var m1 = d.getMonth() + 1;
var month = ('0' + m1).slice(-2);
var year = d.getFullYear();

function dom(d) {
	return (d.getDate() < 10 ? '0' : '') + d.getDate();
}

window.onload = function tf() {
	document.getElementById('dateid').innerHTML = year + month + day;
    document.getElementById('wordid').innerHTML = word[0];
};
</script>
</head>

<body>
<p>Current Date: <span id='dateid'></span></p>
<p>word: <span id='wordid'></span></p>
</body>
</html>

 

4 answers to this question

Recommended Posts

  • 0
Grand Master

Seahorsepip Veteran

Posted
  • Veteran
Posted

Let's start by making a date: 

let date = new Date();

Then let's get our word: 

document.getElementById('wordid').innerHTML = word[Math.round((date.getMonth() + 1) / 3) - 1)]; //Pick a different word every 3 months

As for the readable date string, consider using toLocaleDateString(): 

document.getElementById('dateid').innerHTML = date.toLocaleDateString();

As for the formatting, see the following options documentation: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date/toLocaleDateString#Using_options

 

 

As for every 30 days instead of every 3 months, see the many solutions/workarounds on stackoverflow: https://stackoverflow.com/questions/8619879/javascript-calculate-the-day-of-the-year-1-366

Or be lazy and use a library like moment.js for everything date related, day of year is as simple as: 

let day = moment().dayOfYear();

Then you simply do: 

document.getElementById('wordid').innerHTML = word[Math.round(day / 30) - 1)]; //Pick a different word every 30 days

 

  • 0
Grand Master

DevTech

Posted
Posted
  On 14/12/2017 at 09:19, Seahorsepip said:

 

As for every 30 days instead of every 3 months, see the many solutions/workarounds on stackoverflow: https://stackoverflow.com/questions/8619879/javascript-calculate-the-day-of-the-year-1-366

Or be lazy and use a library like moment.js for everything date related, day of year is as simple as: 

let day = moment().dayOfYear();

Then you simply do: 

document.getElementById('wordid').innerHTML = word[Math.round(day / 30) - 1)]; //Pick a different word every 30 days

 

Expand  

Using a well tested Library is never lazy. It is good engineering. It reduces the chances of bugs and saves time to focus on the main purpose of your app. And date calculations can be crazy akin to rolling your own encryption!

 

For reference, NodaTime is great for .NET and it has been ported to Java as JodaTime:

 

https://nodatime.org/

 

http://www.joda.org/joda-time/

 

For JavaScript, I agree with moment.js

 

https://momentjs.com/

 

 

  • 0
Grand Master

Seahorsepip Veteran

Posted
  • Veteran
Posted
  On 18/12/2017 at 08:13, DevTech said:

Using a well tested Library is never lazy. It is good engineering. It reduces the chances of bugs and saves time to focus on the main purpose of your app. And date calculations can be crazy akin to rolling your own encryption!

 

For reference, NodaTime is great for .NET and it has been ported to Java as JodaTime:

 

https://nodatime.org/

 

http://www.joda.org/joda-time/

 

For JavaScript, I agree with moment.js

 

https://momentjs.com/

 

 

Expand  

With lazy I was referring to developers using external JS libraries for almost every single line of code resulting in 30 dependencies for 50 lines of code.

Libraries are great but the moment you use libraries like https://www.npmjs.com/package/sum-of-two-numbers you should start getting worried :shiftyninja:

  • 0
Grand Master

DevTech

Posted
Posted
  On 18/12/2017 at 11:08, Seahorsepip said:

With lazy I was referring to developers using external JS libraries for almost every single line of code resulting in 30 dependencies for 50 lines of code.

Libraries are great but the moment you use libraries like https://www.npmjs.com/package/sum-of-two-numbers you should start getting worried :shiftyninja:

Expand  

Yeah but... you made that particular point in the context of Date Calculations which few people realize are a tricky minefield, so it might have been more informative to say something like "if you are one of those minimalists that hate to use libraries, here is an area you should make an exception"

 

But I could have worded my comment better since it is hard to get posts in this sub-forum and quibbling over details when you were providing some great help was mainly stupid on my part.

 

I love that sum function for sheer understated Monty Pythonish afrontery. In keeping with that venerable Bristish tradition it would be nice if we could dream up a pull request on the project! It hasn't been updated in 3 years...

 

This topic is now closed to further replies.
 Share
Go to question listing

  • Recently Browsing   0 members

    • No registered users viewing this page.

  • Posts

    • Redesigned Windows 11 Start menu: What users wanted and what Microsoft delivered

      By +Eternal Tempest · Posted

      Seem like they are seeking for a one size fits all. You have power users and "what's a computer" generation growing up on phones, tablets, and Chromebooks.
    • Redesigned Windows 11 Start menu: What users wanted and what Microsoft delivered

      By +Eternal Tempest · Posted

      Guessing it was profitable enough inserting prompted apps vs the hate it generated.
    • Steam overlay's FPS counter gets major upgrade to show CPU and VRAM usage, temps, and more

      By Thiefyo · Posted

      Also good for Debugging or troubleshooting your game.. i dont get it why nvidia app or amd does not show this data.. if steam can do it..
    • Facebook's mobile app is finally getting support for passkeys

      By Thiefyo · Posted

      i have it since 3rd june
    • Microsoft reportedly planning to lay off thousands of employees, mostly in sales

      By Usama Jawad96 · Posted

      Microsoft reportedly planning to lay off thousands of employees, mostly in sales by Usama Jawad Back in May 2025, Microsoft decided to lay off 3% of its workforce, which amounted to roughly 6,000 employees. It claimed that this decision allowed it to implement better organizational changes in a "dynamic marketplace". Now, a new report claims that the Redmond tech firm is planning to lay off thousands more next month. Citing unnamed sources, Bloomberg reports that as the company continues investing heavily in its AI ventures, it is about to announce layoffs of thousands of workers as early as next month. This reduction in workforce will primarily affect sales teams, but they won't be the only ones affected. That said, the sources did mention that the timing for this announcement may change. This move, if true, won't be entirely surprising. In April 2025, Microsoft announced that it will be relying more on third-party firms to sell its software to small- and medium-sized customers. It's currently unclear how many employees will be impacted by this change, but even if the layoff percentage is in the single digits, it would still be significant as it would be impacting the professional careers of thousands. The May 2025 layoffs primarily impacted engineering and product teams. The other major round of layoffs prior to this was the decision to eliminate 10,000 jobs back in January 2023. Those represented 5% of the total workforce at that time, with numerous teams, including the one leading Mixed Reality (MR) efforts, being heavily impacted. It is interesting to note that if the timing of the announcement for layoffs is accurate, it would be soon after Microsoft closes its fiscal year at the end of June 2025. Although we'll get financial reports for the latest quarter soon after too, one has to wonder what the human cost of profit is, as Microsoft continues to report billions of dollars in revenue every quarter. Source: Bloomberg (paywall)

  • Recent Achievements

    • First Post
      Fuzz_c earned a badge
      First Post
    • First Post
      TIGOSS earned a badge
      First Post
    • Week One Done
      slackerzz earned a badge
      Week One Done
    • Week One Done
      vivetool earned a badge
      Week One Done
    • Reacting Well
      pnajbar earned a badge
      Reacting Well

  • Popular Contributors

    1. 1
      +primortal
      704
    2. 2
      ATLien_0
      284
    3. 3
      Michael Scrip
      214
    4. 4
      +FloatingFatMan
      194
    5. 5
      Steven P.
      131
    Show More

  • Tell a friend

    Love Neowin? Tell a friend!