In the beginning, God created the heavens and the earth... Oh, my apologies; that is for bible study.
Plans must be operated pursuant to their 'written documents'. That's Section 401(a)(1) of the Internal Revenue Code; which is like Chapter 1, Verse 1 of everything we know.
I cannot even fathom a situation where verbal communication would supersede the written language in the plan. I think that was Kevin C's point.
Documents are, generally, written to address the time frame for the calculation while leaving the deposit timing open. For instance, a match this is calculated using compensation and deferrals during a payroll period is just that; a calculation that is performed for a certain time frame. It says nothing about the deposit timing; or that you have until the tax filing deadline for a deduction.
Now, if it is a Safe Harbor Match, then there are some deposit timing issues for the match that is done more frequently than the plan year. (like end of the following quarter).
I say this to reemphasize what many of us have been saying for the longest.... RTFD. I'm not saying it with any emotion, but it's just that the answers are there over 99% of the time. Now, there are instances where language in the plan may be tricky (e.g. timing of calculation vs. timing of deposits), but we can work through that. We must first agree, however, that only one thing trumps the plan document; and that's the Treasury Regulations; not the spoken words of an owner.
Good Luck!