strtotime + date_i18n timezone cross-wiring shifts displayed dates

[chubes4]

Bug Description

The EventDetails block render callback uses strtotime() + date_i18n() to format dates. Because WordPress sets PHP's default timezone to UTC but date_i18n() formats in the site timezone (America/Chicago), date-only strings (no time component) get shifted backward by the timezone offset.

Affected Locations

File	Line	Code
inc/Blocks/EventDetails/render.php	129	date_i18n( get_option('date_format'), strtotime($start_datetime) )
inc/Blocks/EventDetails/render.php	131	date_i18n( get_option('time_format'), strtotime($start_datetime) )
inc/Blocks/EventDetails/render.php	139	date_i18n( get_option('date_format'), strtotime($occ_date) )
inc/Blocks/Calendar/templates/results-counter.php	22	date_i18n( 'M j', strtotime($page_start_date) )
inc/Blocks/Calendar/templates/results-counter.php	23	date_i18n( 'M j', strtotime($page_end_date) )

How It Breaks

WordPress's wp-settings.php calls date_default_timezone_set('UTC'). So:

strtotime("2026-04-06")  // → midnight UTC: 2026-04-06 00:00:00 UTC
date_i18n('date_format', ...)  // → formats in CDT (UTC-5): 2026-04-05 19:00 
// Result: April 5 (Sunday) instead of April 6 (Monday) — shifted BACK 1 day

For date+time strings like "2026-04-06 18:00": 18:00 UTC → 13:00 CDT, still April 6. Works only because 18:00 - 5h = 13:00 doesn't cross midnight.

For early morning events like "2026-04-06 02:00": 02:00 UTC → 21:00 CDT previous day → wrong date.

Fix

Replace strtotime() + date_i18n() with timezone-aware DateTime:

// Instead of:
date_i18n( $format, strtotime( $date_string ) );

// Use:
$dt = new DateTime( $date_string, wp_timezone() );
echo $dt->format( $format );

Or use wp_date() which handles timezone correctly:

echo wp_date( $format, strtotime( $date_string . ' 00:00:00' ), wp_timezone() );

Severity

This is a latent bug — it doesn't affect the current Monday Night Funk Jam issue (which is caused by #1) but will cause incorrect date display for:

• Occurrence dates in the single-event view
• Any event with start time before 5:00 AM CDT / 6:00 AM EDT
• The calendar results counter pagination dates