Dinamic date condition in Tiered Hardware for Varying SLA or SLO

Hi, I’m Juan,
I am building a hot-warm-cold arquitecture and i am sharding my On-Premise Mongob deployment to have a hot- warm - clod storage, but in the part of defining “Tiered Hardware for Varying SLA or SLO” i would want to know how to define dinamic ranges. I mean, I don’t want to define a static date to determinate where is going to go the data, I want to define that, for example, if a data is a week old send it to other zone.
Thanks in advance