There are multiple definitions - click on the translation that matches your context.

完工日

名词

full

completion date

noun

Definitions of completion date

in a real estate contract, the date when the ownership of real estate is transferred to the new owner

Almost all purchases require fire and earthquake insurance to be set up prior to completion date.

the date on which a business transaction or project is due to be finalized

If it's important to you that a job is completed by a certain date, fix a completion date and state that 'time is of the essence'.