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setDateTimeFormat

Note

This is a point-in-time snapshot of the API documentation from January 2026. Going forward, we will not be maintaining a public copy of these references, and recommend users to refer to the built-in signature helpers available in the Hack LSP instead for complete and up-to-date information.

The date time format is a message format pattern used to compose date and time patterns

public function setDateTimeFormat(
  string $dateTimeFormat,
): void;

The default value is "0 1", where 0 will be replaced by the date pattern and 1 will be replaced by the time pattern.

This is used when the input skeleton contains both date and time fields, but there is not a close match among the added patterns. For example, suppose that this object was created by adding "dd-MMM" and "hh:mm", and its datetimeFormat is the default "0 1". Then if the input skeleton is "MMMdhmm", there is not an exact match, so the input skeleton is broken up into two components "MMMd" and "hmm". There are close matches for those two skeletons, so the result is put together with this pattern, resulting in "d-MMM h:mm".

Parameters​

  • string $dateTimeFormat - Format pattern. 0 replaced by the date pattern, 1 replaced by the time pattern.

Returns​

  • void