Effective date for New Entity

Can a cash balance plan have a full calendar year plan (i.e., effective date of 1/1) if the entity only came into existence in the middle of the year?

I remember a prior discussion thread on this with differing opinions but most opining that they thought it was OK. Someone better at finding prior discussions than me might post that for you.

It's a question of limitations, which the IRS says should be measured on a full year basis anyway. 

My understanding from IRS conference speakers in the past is yes, retro to 1/1 is ok even if the entity did not exist on 1/1.