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Regression: AOT DateTime::add/sub with DateInterval is a silent no-op for format/getTimestamp (re-#33781/#30760, ext/date/php_date.c) #33911
Description
Category
bug · AOT DateTime mutation / compile-time stamp staleness
Problem
After #33906 / #32691 stamp publishing, AOT DateTime::add/sub with a literal DateInterval updates the LLVM __dt_timestamp slot (or should) but leaves compileTimeDateTimeTimestamp / dateTimeLocalInstants on the receiver stale. DateTime::getTimestamp() and format() prefer the compile-time stamp, so the mutation is a silent no-op vs Zend.
| Repro | Zend 8.x | AOT (master @ 91dc615) |
|---|---|---|
$d=new DateTime('2020-01-15'); $d->add(new DateInterval('P1M')); echo $d->format('Y-m-d'); |
2020-02-15 |
2020-01-15 |
same + getTimestamp() |
1581724800 |
1579046400 (unchanged) |
$d=new DateTime('2020-03-15'); $d->sub(new DateInterval('P1M')); |
2020-02-15 |
2020-03-15 |
VM and JIT match Zend on the same tree. script/aot-smoke.sh is 8/8.
php-src reference
- php/php-src
ext/date/php_date.c—zim_DateTime_add/zim_DateTime_sub
PHP implementation target
ext/standard/JitDateMutation.php— after mutableadd/subcompile-time or LLVM apply, refresh or invalidatecompileTimeDateTimeTimestamp+dateTimeLocalInstantsso subsequentformat/getTimestampsee the new instant (peer#33906stamp publish)
Repro
./script/aot-smoke.sh # must stay 8/8
./script/docker-exec.sh -- bash -lc 'php test/repro/issue_datetime_add_sub_p1m.php; php bin/compile.php -o /tmp/x.bin test/repro/issue_datetime_add_sub_p1m.php; /tmp/x.bin'Done when
- AOT matches Zend for
add/sub+format/getTimestamponP1M - Unit/repro guard under
test/unit+test/repro -
./script/aot-smoke.shstill 8/8
Activity
PurHur commentedon Aug 22, 2026
claim: implementer-worker-lane-c — starting this run (lane C: 33911%3==2; north-star #32122/#31968 closed; AOT DateTime::add/sub silent no-op vs Zend after stamp publish).
AOT: refresh DateTime stamps after add/sub so format matches Zend (#3…
AOT: fluent DateTime::modify chain must not drop later mutations (#33935