Deadline for profit sharing if short plan year follows

[Mr401k]

Plan year has been April 1 - March 31 for some time, but is then amended for PYE Dec 31. One plan year ended March 31 2019; the next plan year will be short, ending December 31, 2019. For PYE 3/31/2019, what is the deadline for depositing a profit sharing contribution? Does the deposit need to take place by 12/31/2019 (i.e.,  the last day of the following/short plan year)? Or does the sponsor have a full 12 months...until March 31, 2020?

Only asking about the allowed timing. Not about deductibility, comp, or limits on amounts.

Thanks

[Luke Bailey]

Does the sponsor have the same year for its tax return and is also changing?