[Alneyan]

Omni is latin, whereas the word you have in mind for time is greek, so there might be a problem here (though some words have been created with both roots in Indo-European languages). More importantly, the greek word for time is chronos, so it should be omnichronon, or something to that effect.

Then again, there is a Unix command called cron that starts a command or a script at a given time, so. Who knows?