Regression: IntlDateFormatter::format()/datefmt_format() reject localtime() array — false not formatted date (ext/intl/dateformat)

[PurHur]

Category

Stdlib · php-src-strict · ext/intl dateformat

Problem

Zend’s IntlDateFormatter::format() and datefmt_format() accept an associative array from localtime($ts, true) (tm_year/tm_mon/…) and format it. On the VM both OOP and procedural entry points return false for the same array, while DateTime / Unix timestamp operands format correctly.

Repro	Zend 8.2 + intl (2026-07-24)	VM (2026-07-24)
$fmt->format(localtime($ts, true)) with pattern yyyy-MM-dd	'2024-07-24'	false
datefmt_format($fmt, localtime($ts, true))	'2024-07-24'	false
$fmt->format($dt) / $fmt->format($ts)	'2024-07-24'	'2024-07-24' (OK)

php-src reference

• php/php-src ext/intl/dateformat/dateformat_format.c — intl_datetime_decompose / localtime array handling
• php/php-src ext/intl/dateformat/dateformat_attr.c — format attribute path
• Related history: Stdlib: ext/intl — IntlDateFormatter create/format (ext/intl/dateformat) #5201, Stdlib: IntlDateFormatter::parse()/parseToCalendar()/localtime()/getTimeZone() missing after #5201 (ext/intl/dateformat) #20729, Regression: datefmt_localtime()/IntlDateFormatter::localtime() returns false after #20729/#20803 (ext/intl/dateformat) #21150 (localtime() method), not this format($localtimeArray) operand

PHP implementation target

• PHP intl dateformat implementation under ext/intl/ (and any JIT lowering) — accept localtime(..., true) arrays like php-src; keep C out of runtime/
• Share conversion helper between OOP format and datefmt_format

Repro

./script/docker-exec.sh -- bash -lc 'php bin/vm.php -r "
\$ts = strtotime(\"2024-07-24 12:00:00 UTC\");
\$fmt = datefmt_create(\"en_US\", IntlDateFormatter::SHORT, IntlDateFormatter::NONE, \"UTC\", IntlDateFormatter::GREGORIAN, \"yyyy-MM-dd\");
\$lt = localtime(\$ts, true);
var_export((new IntlDateFormatter(\"en_US\", IntlDateFormatter::SHORT, IntlDateFormatter::NONE, \"UTC\", IntlDateFormatter::GREGORIAN, \"yyyy-MM-dd\"))->format(\$lt));
echo PHP_EOL;
var_export(datefmt_format(\$fmt, \$lt));
echo PHP_EOL;
"'

Expect Zend: '2024-07-24' twice. VM today: false twice.

Done when

• OOP + procedural format/datefmt_format match Zend for localtime($ts, true) arrays
• DateTime / int timestamp paths stay green
• Compliance/repro guard
• php-src-strict; no php-compiler-strict shortcut