Looking for some help with the date of the Employment Contract for hiring a helper please.

I'm hiring an awesome finished contract Filipino helper and filling in the Employment Contract form. The yellow guide book says "The application (for change of employment) must be submitted by the Helper in person within four weeks prior to the expiry of the contract" to immigration.

Would the date of the Employment Contract need to be within 4 weeks from the expiry of her current employer? E.g. her current contract finishes 10 March, and I want her to start 20 March, so we can only date ID407 after 11 Feb?

Or is the "4 week limit" only applicable to the HK visa/immigration documents (ID988A & ID988B)?