Simply works

Does its job. The difference between the timestamp and now is in seconds, but a tooltip will show the difference in days/hours/mins. Its not obvious though.

I also wish the app would examine the clipboard to see if it looks like unix timestamp, and convert that on opening.

EDIT 2015-02: It would also be nice if it was updated for dark mode on Yosemite.

ephp about Epochulator unix time calculator