  Time crystals are proposed states of matter which spontaneously break time
translation symmetry. There is no settled definition of such states. We offer a
new definition which follows the traditional recipe for Wigner symmetries and
order parameters. Supplementing our definition with a few plausible assumptions
we find that a) systems with time independent Hamiltonians should not exhibit
TTSB while b) the recently studied $\pi$ spin glass/Floquet time crystal can be
viewed as breaking a global internal symmetry and as breaking time translation
symmetry as befits its two names.
