Imagine you want to announce an event with participants across different time zones.
Simply set the time, in your time zone, and permatime.com will generate a link for it.
If you share this link with others, they will see that time in their own local time zone
(and any other zones they choose).
Use a permatime link to arrange a phone call, timestamp a blog post, announce a webinar…
Just brilliant. Now we just need it integrated in TweetDeck et al.