[tehno]

I made something similar for myself, but my needs were to see local and UTC time, and to copy current unix timestamp and current ISO date-time string.

Also has some typographic trickery so the width of time shown is always constant, and doesn't "flicker" on the menu bar moving other icons by few pixels every minute.

Here it is in a gist: https://gist.github.com/erkiesken/e13943550c4b2ba03779d5eac5...