Rainbow Equinox is already listed as a Roblox limited item on Rolimon’s, so there isn’t a separate “went limited” date shown in the result I found.

If you meant the original Equinox item, it was released in the marketplace on December 17, 2009, and it is still marked as available rather than limited.

What this means

  • Rainbow Equinox : currently limited.
  • Equinox : released December 17, 2009, still available.

If you want, I can also help identify whether you meant Rainbow Equinox , Omega Rainbow Equinox , or a different Equinox variant.