function date_make_iso_valid in Date 8

Same name and namespace in other branches

1. 7.3 date_api/date_api.module \date_make_iso_valid()
2. 7.2 date_api/date_api.module \date_make_iso_valid()

This function will replace ISO values that have the pattern 9999-00-00T00:00:00 with a pattern like 9999-01-01T00:00:00, to match the behavior of non-ISO dates and ensure that date objects created from this value contain a valid month and day. Without this fix, the ISO date '2020-00-00T00:00:00' would be created as November 30, 2019 (the previous day in the previous month).

@TODO Expand on this to work with all sorts of partial ISO dates.

Parameters

string $iso_string: An ISO string that needs to be made into a complete, valid date.

File

date_api/date_api.module, line 645

This module will make the date API available to other modules. Designed to provide a light but flexible assortment of functions and constants, with more functionality in additional files that are not loaded unless other modules specifically include them.

Code

function date_make_iso_valid($iso_string) {

  // If this isn't a value that uses an ISO pattern, there is nothing to do.
  if (is_numeric($iso_string) || !preg_match(DATE_REGEX_ISO, $iso_string)) {
    return $iso_string;
  }

  // First see if month and day parts are '-00-00'.
  if (substr($iso_string, 4, 6) == '-00-00') {
    return preg_replace('/([\\d]{4}-)(00-00)(T[\\d]{2}:[\\d]{2}:[\\d]{2})/', '${1}01-01${3}', $iso_string);
  }
  elseif (substr($iso_string, 7, 3) == '-00') {
    return preg_replace('/([\\d]{4}-[\\d]{2}-)(00)(T[\\d]{2}:[\\d]{2}:[\\d]{2})/', '${1}01${3}', $iso_string);
  }

  // Fall through, no changes required.
  return $iso_string;
}