effective date
Definitions
The specific calendar date upon which a contract, agreement, or policy officially begins to be in force.
The date on which a legal document or administrative action becomes legally binding or operative.
Examples
The effective date of the new company policy is set for the first of next month.
Please ensure that the contract reflects the correct effective date before signing.
Synonyms
commencement date start date activation date inception date implementation date
Antonyms
expiration date termination date end date cessation date expiry date