CODEWITHSUNDEEP
javascript
Mason Wheeler
Mason Wheeler

Reputation: 84550

How does JavaScript represent DateTime values internally?

I'm working on a program that uses JavaScript for scripting. Like most script systems, there's a predefined library of native functions that scripts can call into, and I just added a new one.

The new function takes a DateTime (it's in Delphi, where a DateTime is represented internally by a Double), a string and a boolean. The last two parameters come through just fine, but it appears that somewhere in the system, the time value is getting mangled. Instead of a recognizable DateTime, I get 1362394800000, which doesn't make any sense according to Delphi's timestamp scheme.

Where can I find information on how JavaScript represents DateTime values, so I can figure out how to translate this into something my Delphi code can use? (This is using Microsoft's JScript system that comes standard with Windows 7, in case the implementation varies.)

Upvotes: 4

Views: 1216

Answers (3)

Niet the Dark Absol
Niet the Dark Absol

Reputation: 324630

JavaScript represents Date objects as a number of milliseconds since the Epoch. This is important, because most other systems and languages use just integer seconds.

So assuming Delphi is one such second user, you should be able to divide the number by 1000 and pass it in.

Upvotes: 5

Bergi
Bergi

Reputation: 664464

JavaScript Date values are internally represented as milliseconds since unix epoch; that's the value you get by using .getTime() are casting the object to a number.

Upvotes: 1

Chris Cooper
Chris Cooper

Reputation: 5122

It's stored as a number of milliseconds since 1/1/1970 00:00:00.000

Upvotes: 1

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