Timestamp Confusion UST

Hey there,

In attempt to make a OAUTH Request I create a timestamp by doing the following:

return tostring(os.time())

the returned timestamp is identical with the one here: http://www.unixtimestamp.com/index.php ( UST )

Does that mean that the os.time() function returns a UST timestamp and I can be shure that it will be the same no matter where / in which timezone the app is used?

Any help appreciated:

Roman