Wrong month name declension

[pavelevap]

Previously #11226.

Czech month names:

June - Červen - června (declension)
July - Červenec - července (declension)

When I use j. F Y date format, website displays for example 10/7/2015 as 10. červnaec 2015 instead of 10. července 2015.

You can try to Google červnaec, there are many results for this wrong declension.

[pavelevap]

Problem is actually in preg_replace() function here: https://core.trac.wordpress.org/browser/tags/4.5.2/src/wp-includes/functions.php#L192

[pavelevap]

@SergeyBiryukov: Hi, there are many reports related to this problem and July is slowly coming :-( All websites with particular date format are affected in our language. Should I create plugin for filtering date or localization cs_CZ.php file?

[ocean90]

#36986 was marked as a duplicate.

[ocean90]

#37034 was marked as a duplicate.

[semil]

Hi everyone,

I would like to notice bug in function wp_maybe_decline_date for preg_replace pattern.
In our czech language we have 2 months with similar root word so it detects previous month and replace this root word.
Solutions is update pattern for preg_replace from

'#' . $month . '#'

to

'/\b' . $month . '\b/u'

Best regards,
Jan

[SergeyBiryukov]

In 37716:

I18N: Add a unit test for wp_maybe_decline_date().

See #36790.

[SergeyBiryukov]

In 37717:

I18N: Adjust the regex in wp_maybe_decline_date() to handle word boundaries correctly.

Props semil.
Fixes #36790.

[SergeyBiryukov]

In 37718:

I18N: Revert the test added in [37716], as it causes errors when running the full suite.

See #36790.

[ocean90]

In 37975:

I18N: Add tests for wp_maybe_decline_date().

Reverts [37718], $wp_locale needs to be cloned.

Props SergeyBiryukov.
Fixes #36790.

[SergeyBiryukov]

In 37979:

I18N: Adjust the regex in wp_maybe_decline_date() to avoid \w and \b, as they don't work with Unicode characters correctly in PHP 5.3.3 and earlier versions.

See [37975] for unit tests.

See #36790.