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Date of birth data content standard

Purpose of standard

The purpose of this standard is to mandate ISO 8601, Date and time — representations for information interchange — part 1: basic rules, to be used to format date of birth for sharing purposes.

This standard does not mandate the collection or storage of date of birth. These may vary depending on the needs of the agency.

ISO 8601 - 1:2019 Date and time — representations for information interchange — part 1: basic rules

Definition

The date of birth is the year, month, and day a natural person was born.

Compliance

The minimum required format for compliance when sharing date of birth information is YYYY-MM-DD (or YYYYMMDD).

The standard does not require date of birth data to be verified, but if it is this may be useful information to be noted when shared.

Further information

ISO 8601 Date representation and format examples:

  • ‘2018-08-01’ is a date and time expression that indicates the first day of August of 2018 in the Gregorian calendar.
  • [date] is a date and time representation that can be expanded as [year][month][day], which itself can be expanded into [YYYY][MM][DD] -  ‘20180801’ is a date and time expression that conforms to this representation.

While this standard does not mandate how date of birth data is collected or stored in databases, guidance on the collection of date of birth can be found in the Statistical standard for age.

Statistical standard for age

Status

Draft (as at 31 October 2019)

Date of birth data content standard [PDF 227 KB]

Contact us

If you would like to know more or provide feedback on this standard, please email datacontentstandards@stats.govt.nz.

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