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Docs: Add TimezoneChange XML doc #1731

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merged 2 commits into from Jun 4, 2022
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Docs: Add TimezoneChange XML doc #1731

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Docs: Add TimezoneChange XML doc
GaryJones Jun 20, 2019
c6e560b
Docs: Refresh restricted datetime functions docs
GaryJones Mar 28, 2022
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50 changes: 50 additions & 0 deletions WordPress/Docs/DateTime/RestrictedFunctionsStandard.xml
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<documentation title="Restricted Date and Time Functions">
<standard>
<![CDATA[
The restricted functions date_default_timezone_set() and date() should not be used.
]]>
</standard>
<standard>
<![CDATA[
Using the PHP native date_default_timezone_set() function isn't allowed, because WordPress Core needs the default time zone to be set to UTC for timezone calculations using the WP Core API to work correctly.
]]>
</standard>
<code_comparison>
<code title="Valid: Using DateTime object.">
<![CDATA[
$date = new <em>DateTime()</em>;
$date->setTimezone(
new DateTimeZone( 'Europe/Amsterdam' )
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Would it be an idea to "WordPressify" this code sample a little more and use something like get_option() with gmt_offset or timezone_string to retrieve the timezone to be passed to new DateTimeZone() ?

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I think the basic PHP example is fine there, people tend to change default time zone to something that is not normal WP time zone.

Again, there is a problem of choice between a technical 1:1 code equivalent and idiomatic rewrite, that is hard to decide on for brief out-of-context example.

);
]]>
</code>
<code title="Invalid: Using date_default_timezone_set().">
<![CDATA[
<em>date_default_timezone_set</em>( 'Europe/Amsterdam' );
]]>
</code>
</code_comparison>
<standard>
<![CDATA[
Using the PHP native date() function isn't allowed, as it is affected by runtime timezone changes which can cause the date/time to be incorrectly displayed. Use gmdate() instead.
]]>
</standard>
<code_comparison>
<code title="Valid: Using gmdate().">
<![CDATA[
$last_updated = <em>gmdate</em>(
'Y-m-d\TH:i:s',
strtotime( $plugin['last_updated'] )
);
]]>
</code>
<code title="Invalid: Using date().">
<![CDATA[
$last_updated = <em>date</em>(
'Y-m-d\TH:i:s',
strtotime( $plugin['last_updated'] )
);
]]>
</code>
</code_comparison>
</documentation>