effective date
The date on which a statute, contract, insurance policy, or other such instrument becomes enforceable or otherwise takes effect, which sometimes differs from the date on which it was enacted or signed.


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Note added at 1 day 7 hrs (2020-11-11 23:49:00 GMT)
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effective date

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► noun
1.

The date on which an order, ruling, appointment, etc., takes effect.
Etymology:
Early 20th century; earliest use found in Columbia Law Review.


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Note added at 1 day 7 hrs (2020-11-11 23:49:43 GMT)
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effective date
effective date

effective date noun [C] (usually the effective date [sing.])
(Law )

1
the date on which a law or rule comes into use:
□ The effective date of the court order has been delayed for two weeks.

2
a date chosen in a legal contract for when sth will happen or when sth must be done:
□ These changes to your policy apply from the effective date shown below.
□ On the effective date, the seller will transfer the shares to the buyer.



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Note added at 1 day 7 hrs (2020-11-11 23:58:54 GMT)
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https://www.communities-ni.gov.uk/publications/guaranteed-mi...