Javascript: how do I add seconds to a date? [resolved]

[longwolf]

how do I add seconds to a date?

I'm just starting to work with Javascript but I need this pretty fast.

I need to design a Javascript function that works something like VB's dateadd() function.
It only needs to do seconds so it would look something like this:

function addSeconds(myDate, Seconds)
{
//Needed Code...newDate = myDate + Seconds;

return newDate;
}

Alternately, a function that just adds xx seconds to the current date will work.

function DatePlusSecs(Seconds)
{
var myDate = new Date();
//Needed Code....newDate = myDate + Seconds;
return newDate;
}

I've been searching web sites for this but haven't found anything that i could understand/make work.

[invitro]

I'm not really familiar with VB's addDate() function.

Could you specify the date format you are using? Is it a string? Is your date a number in minutes?

[longwolf]

I'm using:
myDate = new Date();
as part of a timer loop.

I need to add XX seconds to myDate so I can use:
if (Date() > myDate) {}
to trigger an action.

I'd like to be able to display myDate to the user in a format that makes sense to them. i.e. date and time

[CornedBee]

To trigger a delayed action use setTimeout().

[longwolf]

I guess I need to make things a bit more clear.
I writing a fairly complex program with javascript.
There is a main loop that can call several subs depending on what happens.

Some of those sub-functions must not run too often.
That's why I need be able to add xx seconds to a variable that holds a date for testing against Date().

I also need to be able to pull up that date variable and look at it.

This is actually a script that's followed by a C++ program.
I did try using setTimeout() to controll a flag, but the C++ app gave me "setTimeout is not defined"

But that command would not have given me all that I need anyway

[CornedBee]

This is actually a script that's followed by a C++ program.

What do you mean by that? Who interprets the JavaScript?

[longwolf]

Originally posted by CornedBee
What do you mean by that? Who interprets the JavaScript?

I worded that badly.

It's part of a macro-ing program.

The C++ app is a "go-between" program.
It tracks and interprets what's happening in a 3rd program and can send commands to the 3rd program.

It has it's own function calls that the Javascript uses to get values from the 3rd program and more functions to tell the C++ app which commands to send to the 3rd program.

It also has some error checking that it uses to tell you when it finds an error in your Javascript.

I don't have the source code for the C++ app (wish I did) so I can't tell you any more about it.

Here's the silly part. Like I said, I'm new to Javascript and at this point I know more of the C++ app's function calls than I know of Javascript functions : D

That's why I'm asking someone to show me how to "add xx seconds to a date variable"

[CornedBee]

devedge.netscape.com has a complete JavaScript reference somewhere.

[longwolf]

Originally posted by longwilf
I've been searching web sites for this but haven't found anything that i could understand/make work.

I've been studying a Lot of tutorial sites.

[CornedBee]

devedge is a reference, not a tutorial.

Quite easy to figure out after reading a bit and trying a bit:

function addSecs(d, s) {
  return new Date(d.valueOf()+s*1000);
}

[longwolf]

Originally posted by CornedBee
devedge is a reference, not a tutorial.

Quite easy to figure out after reading a bit and trying a bit:

function addSecs(d, s) {
  return new Date(d.valueOf()+s*1000);
}

Easy for you maybe : )

From the sites I looked at it seemed like I'd have to build the a date step at a time.

This is GREAT!

Thx CornedBee