I started out doing it between "coming home from work" and "having dinner", but that didn't really work out. Some days, I came really late and my GF was already waiting with dinner ready, other days I would go to meetup, hang out with friends etc.
I'm now doing Yoga and Meditation every morning after waking up, and there's just much less that can get in the way.
My GF and me are right now building an iOS app for forming a daily habit of Meditation and/or Yoga, based on our own experience and reading the book "Hooked: How to build habit-forming products". If you (or anyone else!) would like to beta-test, shoot me a mail at chris [at] screenscott.com :-)
There really isn't a specific time meditation should be done, you just need to find what works for you.