How to set the value of a field when modifying another?

[Faly_Rabedaoro]

Hi all,

how to set the value of a field when modifying another?
I have 4 fields, in the same table

1. [validation1]
2. [date validation 1]
3. [validation2]
4. [validation date 2]

I want [date validation 1] = today () when I fill the field or modify [validation1]
I want [date validation 2] = today () when I fill the field modify [validation2]

Help me please