Determines if the date should be declined.
Description
If the locale specifies that month names require a genitive case in certain formats (like ‘j F Y’), the month name will be replaced with a correct form.
Parameters
$date
stringrequired- Formatted date string.
$format
stringoptional- Date format to check.
Default:
''
Source
function wp_maybe_decline_date( $date, $format = '' ) {
global $wp_locale;
// i18n functions are not available in SHORTINIT mode.
if ( ! function_exists( '_x' ) ) {
return $date;
}
/*
* translators: If months in your language require a genitive case,
* translate this to 'on'. Do not translate into your own language.
*/
if ( 'on' === _x( 'off', 'decline months names: on or off' ) ) {
$months = $wp_locale->month;
$months_genitive = $wp_locale->month_genitive;
/*
* Match a format like 'j F Y' or 'j. F' (day of the month, followed by month name)
* and decline the month.
*/
if ( $format ) {
$decline = preg_match( '#[dj]\.? F#', $format );
} else {
// If the format is not passed, try to guess it from the date string.
$decline = preg_match( '#\b\d{1,2}\.? [^\d ]+\b#u', $date );
}
if ( $decline ) {
foreach ( $months as $key => $month ) {
$months[ $key ] = '# ' . preg_quote( $month, '#' ) . '\b#u';
}
foreach ( $months_genitive as $key => $month ) {
$months_genitive[ $key ] = ' ' . $month;
}
$date = preg_replace( $months, $months_genitive, $date );
}
/*
* Match a format like 'F jS' or 'F j' (month name, followed by day with an optional ordinal suffix)
* and change it to declined 'j F'.
*/
if ( $format ) {
$decline = preg_match( '#F [dj]#', $format );
} else {
// If the format is not passed, try to guess it from the date string.
$decline = preg_match( '#\b[^\d ]+ \d{1,2}(st|nd|rd|th)?\b#u', trim( $date ) );
}
if ( $decline ) {
foreach ( $months as $key => $month ) {
$months[ $key ] = '#\b' . preg_quote( $month, '#' ) . ' (\d{1,2})(st|nd|rd|th)?([-–]\d{1,2})?(st|nd|rd|th)?\b#u';
}
foreach ( $months_genitive as $key => $month ) {
$months_genitive[ $key ] = '$1$3 ' . $month;
}
$date = preg_replace( $months, $months_genitive, $date );
}
}
// Used for locale-specific rules.
$locale = get_locale();
if ( 'ca' === $locale ) {
// " de abril| de agost| de octubre..." -> " d'abril| d'agost| d'octubre..."
$date = preg_replace( '# de ([ao])#i', " d'\\1", $date );
}
return $date;
}
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