iDeCo (and T-NISA) deposit dates re weekends/Holidays

[Seasider4374]

I'm 99% sure of the answer to my query but figure it can't hurt to check so as to avoid any issues.

If my iDeCo/T-NISA funding dates fall on a weekend or national holiday will the funds be taken on a day before the scheduled date, or on the next business day following the holiday?

Just want to get my calendar notifications check set up right to ensure deposit accounts are properly funded...