Solved

JavaScript: Test if hour inside time span

Posted on 2013-01-24
2
330 Views
Last Modified: 2013-01-28
Using JavaScript, how can I test if an hour is inside a time span?

I cannot just use less than or greater than tests because the hour "0" comes immediately after the hour "23".

If a session begins at 23 (11:00 pm) and lasts for 3 hours, 1 (1:00 am) is inside the session but 9 (9:00 am) is outside the session.

  function checkSessionStatus (SessionStartTime, SessionLength, TimeCurrent) {
   if(1==1) return "Session is active"
   else return "Session is NOT active"
  }

  alert(checkSessionStatus(1, 12, 3));  // Session is active
  alert(checkSessionStatus(22, 12, 3));  // Session is active
  alert(checkSessionStatus(0, 2, 3));  // Session is NOT active
  alert(checkSessionStatus(22, 2, 3));  // Session is NOT active

Open in new window

0
Comment
Question by:hankknight
2 Comments
 
LVL 5

Accepted Solution

by:
Eikroman earned 400 total points
ID: 38818163
Hello,

I'm assuming that the session can last 24 hours max (every hour will then be active)
I'm assuming that start time and current time is in range of [0-23]
The start hour and end hour counts in.

The logic:
If the TimeCurrent is less than SessionStartTime and the sessions spans over two different days (StartTime+Length is greater or equal to 24), then we move the SessionStartTime 24 hours back and recursively call the function.

Then we simply verify if TimeCurrent is greater or equal to SessionStartTime AND is less or equal to end time (SessionStartTime+SessionLength).

The code:
 function checkSessionStatus (SessionStartTime, SessionLength, TimeCurrent) {
 DAY_LENGTH=24;
  	
  	if(SessionStartTime+SessionLength>=DAY_LENGTH&&SessionStartTime>TimeCurrent)
  		return checkSessionStatus(SessionStartTime-DAY_LENGTH, SessionLength, TimeCurrent);
  	else
  		{
  			if(TimeCurrent>=SessionStartTime && TimeCurrent <= SessionStartTime+SessionLength)
  				return "Session is active";
  			else
  				return "Session is NOT active";
  		}
   
  }

Open in new window


Let me know if you need further clarification or have any other question regarding this.
0
 
LVL 9

Assisted Solution

by:Sar1973
Sar1973 earned 100 total points
ID: 38818303
You should record the start and end date with a script like:
var myStartDate = (StartDate);
var myEndDate = (EndDate);
function CheckSession(myEndDate ) {
	var myDate = new Date(); 
	var myDiv1 = document.getElementById("hideshow1");
	var myDiv2 = document.getElementById("hideshow2");
	if (myDate >myStartDate && myDate<myEndDate) {
		alert("In session");
	} else {
		alert("Out of session");
	}
}

Open in new window

0

Featured Post

Highfive Gives IT Their Time Back

Highfive is so simple that setting up every meeting room takes just minutes and every employee will be able to start or join a call from any room with ease. Never be called into a meeting just to get it started again. This is how video conferencing should work!

Join & Write a Comment

Today I would like to talk about localizing (Internationalization) JavaScript applications. Introduction When creating an application that is going to be used by many people around the globe, it is important to remember that not everyone speak…
This article demonstrates how to create a simple responsive confirmation dialog with Ok and Cancel buttons using HTML, CSS, jQuery and Promises
The viewer will learn the basics of jQuery, including how to invoke it on a web page. Reference your jQuery libraries: (CODE) Include your new external js/jQuery file: (CODE) Write your first lines of code to setup your site for jQuery.: (CODE)
The viewer will learn the basics of jQuery including how to code hide show and toggles. Reference your jQuery libraries: (CODE) Include your new external js/jQuery file: (CODE) Write your first lines of code to setup your site for jQuery…

746 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

9 Experts available now in Live!

Get 1:1 Help Now