Convert UNIX timestamp to milliseconds

Question

How can I use PHP to get a UNIX timestamp like what I get from the JS method .getTime()? I seem to be having trouble since .getTime() returns milliseconds. I know I have to convert the timestamps first for JS to read it, but how can I do this?

Edit:

Agreed with the multiply by 1000, but why do I get this?:

timestamp: 1305593400
timestamp * 1000: 1.3055934E+12

timestamp: 1305612420
timestamp * 1000: 1.30561242E+12

timestamp: 1305635400
timestamp * 1000: 1.3056354E+12

timestamp: 1304901960
timestamp * 1000: 1.30490196E+12

timestamp: 1304944620
timestamp * 1000: 1.30494462E+12

Dukas

Answer 1

UNIX timestamps are in seconds. Multiply by 1000.

Burlburlap

The new numbers are too large to fit into an int. But they're still the appropriate number. – Burlburlap

But my JS code cannot read it properly, but with a proper JS getTime() timestamp works just fine but not this. So this doesn't entirely answer my question. – Dukas

Works fine here. js> Date(1.3055934E+12) Tue Jun 21 2011 14:35:12 GMT-0400 (EDT) – Burlburlap

Answer 2

If you really need proper presentation -- use number_format().

$timestamp = 1305593400;
$ms = $timestamp * 1000;
echo number_format($ms, 0, '.', '');

Result: 1305593400000

Supersession

Answer 3

I use it

$unix_date = (time("Ymd", strtotime($r->date)) *1000);

Cavuoto