CODEWITHSUNDEEP
javascriptdate
Daniel Magliola
Daniel Magliola

Reputation: 32412

How do I compare dates in Javascript?

I have the following situation:

I have a certain function that runs a loop and does stuff, and error conditions may make it exit that loop. I want to be able to check whether the loop is still running or not.

For this, i'm doing, for each loop run:

LastTimeIDidTheLoop = new Date();

And in another function, which runs through SetInterval every 30 seconds, I want to do basically this:

if (LastTimeIDidTheLoop is more than 30 seconds ago) {
  alert("oops");
}

How do I do this?

Thanks!

Upvotes: 3

Views: 1666

Answers (4)

Alexandre N.
Alexandre N.

Reputation: 2802

You can do like this:

var dateDiff = function(fromdate, todate) {
    var diff = todate - fromdate;
    return Math.floor(diff/1000);
}

then: 

if (dateDiff(fromdate, todate) > 30){
    alert("oops");
}

Upvotes: 0

chriscena
chriscena

Reputation: 478

Create a date object and use setSeconds().

controlDate = new Date();
controlDate.setSeconds(controlDate.getSeconds() + 30);

if (LastTimeIDidTheLoop > controlDate) {
...

Upvotes: -1

Tomalak
Tomalak

Reputation: 338406

JS date objects store milliseconds internally, subtracting them from each other works as expected:

var diffSeconds = (new Date() - LastTimeIDidTheLoop) / 1000; 
if (diffSeconds > 30)
{
  // ...
}

Upvotes: 7

rob
rob

Reputation: 37684

what about:

newDate = new Date()
newDate.setSeconds(newDate.getSeconds()-30);
if (newDate > LastTimeIDidTheLoop) {
  alert("oops");
}

Upvotes: 5

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