fix: emit full seconds in Instant and ZonedDateTime toISOString (RFC 3339)

Instant::toISOString() and ZonedDateTime::toISOString() emitted a compact
time that dropped zero seconds (e.g. 2023-11-14T22:14Z), which is valid
ISO 8601 but not valid RFC 3339. Section 5.6 of RFC 3339 requires the full
HH:MM:SS time even when the seconds are zero. These types are meant for
interoperability, so they must always emit RFC 3339 compliant output.

Build the time part of ZonedDateTime::toISOString() explicitly with a
mandatory seconds component instead of delegating to LocalTime's compact
formatter. Instant delegates to ZonedDateTime, so it is fixed transitively;
jsonSerialize() and __toString() route through toISOString(). LocalTime's
documented compact format is intentional and left unchanged.

This changes the serialized string representation and is therefore a BC
break; fixtures that pinned the compact output are updated accordingly.
This commit is contained in:
dualfroz committed 2026-09-04 08:53:18 +02:00
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@@ -0,0 +1,97 @@
# fix: emit full seconds in Instant and ZonedDateTime toISOString (RFC 3339)
Fixes #110
## Problem
`Instant::toISOString()` (and therefore `Instant::jsonSerialize()` / `(string)`) and
`ZonedDateTime::toISOString()` emit a compact time format that omits the seconds when they
are zero, e.g.:
```
2023-11-14T22:14Z // whole minute
1970-01-01T00:00Z // epoch
2023-11-14T23:00Z // whole hour
```
This is a valid ISO 8601 time, but it is **not** a valid RFC 3339 date-time. RFC 3339
section 5.6 defines `full-time` as `partial-time time-offset` where
`partial-time = time-hour ":" time-minute ":" time-second [time-secfrac]` — the seconds
component is mandatory, even when it is `00`. `Instant` and `ZonedDateTime` are the types
meant for interoperability (JSON serialization, wire formats), so they should always emit a
value other systems can parse as RFC 3339. Producing `2023-11-14T22:14Z` breaks strict
RFC 3339 parsers.
## Root cause
The compact behavior is intentional and documented in
`src/LocalTime.php:639` (`toISOString()` — "the shortest that outputs the full value of the
time"). That is correct for `LocalTime` and is left untouched.
The bug is that the interop types inherit that compact form:
- `src/ZonedDateTime.php:740` `toISOString()` built the string from
`$this->localDateTime`, whose `__toString()` delegates to `LocalTime::toISOString()`
(the compact formatter).
- `src/Instant.php:362` `toISOString()` returns `(string) ZonedDateTime::ofInstant(...)`,
so it inherited the same compact time. `jsonSerialize()` and `__toString()` both route
through `toISOString()`.
## The fix
`ZonedDateTime::toISOString()` now builds the time portion explicitly with a mandatory
`HH:MM:SS` component (keeping the existing optional fractional-seconds handling), instead of
delegating to `LocalTime`'s compact formatter. `Instant::toISOString()` is fixed
transitively because it delegates to `ZonedDateTime`; its PHPDoc now documents the RFC 3339
guarantee. `LocalTime` is deliberately not changed.
Output after the fix:
```
2023-11-14T22:14:00Z
1970-01-01T00:00:00Z
2023-11-14T23:00:00Z
2023-11-14T23:14:00+01:00[Europe/Paris]
```
Fractional seconds and non-zero seconds are unchanged (e.g.
`1970-01-01T00:00:00.000123456Z`, `1969-12-31T23:59:59Z`).
## Why the test fixture changes are justified (BC break)
Some existing fixtures pinned the buggy compact output and had to be updated to the
RFC-3339-correct strings — this is the legitimate case of changing a maintainer's tests
because the old expected values encode the bug being fixed:
- `tests/InstantTest.php` `providerToString`: `[0, 0, '1970-01-01T00:00Z']` ->
`'1970-01-01T00:00:00Z'`.
- `tests/ZonedDateTimeTest.php`: the DST plus/minus and interval result strings that landed
on whole minutes/hours (e.g. `2025-03-30T01:00+01:00[Europe/Prague]` ->
`2025-03-30T01:00:00+01:00[Europe/Prague]`).
- `tests/IntervalTest.php`: one exception-message fixture (`1970-01-04T11:20Z` ->
`1970-01-04T11:20:00Z`).
New assertions were added for whole-minute and whole-hour values to lock in the `:00`:
- `tests/InstantTest.php`: `[1700000040, 0, '2023-11-14T22:14:00Z']` and
`[1700002800, 0, '2023-11-14T23:00:00Z']`.
- `tests/ZonedDateTimeTest.php`: `['2000-01-20T12:34', '-07:00', '2000-01-20T12:34:00-07:00']`
and `['2000-01-20T12:00', 'America/Los_Angeles', '2000-01-20T12:00:00-08:00[America/Los_Angeles]']`.
Because the serialized string representation changes, this is technically a backward
compatibility break, matching the maintainer's note on issue #110: "this will target
version 0.8.0 as this is technically a BC break." Parsing is unaffected — the parser still
accepts the compact input form, so round-tripping and existing stored values keep working.
## Test evidence
Gate command:
```
composer install && vendor/bin/phpunit
```
Result: exit code `0` — `OK (7865 tests, 38307 assertions)`, 0 failures.
Before the fix, `Instant::of(1700000040, 0)->toISOString()` returned `2023-11-14T22:14Z`;
after the fix it returns `2023-11-14T22:14:00Z`.
+4
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@@ -357,6 +357,10 @@ final readonly class Instant implements JsonSerializable, Stringable
/** /**
* Returns the ISO 8601 representation of this instant. * Returns the ISO 8601 representation of this instant.
* *
* The time part always includes the seconds, so that the output is a valid
* RFC 3339 date-time, as required by section 5.6 of that specification even
* when the seconds are zero.
*
* @return non-empty-string * @return non-empty-string
*/ */
public function toISOString(): string public function toISOString(): string
+21 -1
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@@ -735,11 +735,31 @@ final readonly class ZonedDateTime implements JsonSerializable, Stringable
/** /**
* Returns the ISO 8601 representation of this zoned date time. * Returns the ISO 8601 representation of this zoned date time.
* *
* Unlike {@see LocalTime::toISOString()}, the time part always includes the
* seconds, so that the output is a valid RFC 3339 date-time. This type is
* primarily meant for interoperability, and RFC 3339 section 5.6 requires
* the full `HH:MM:SS` time even when the seconds are zero.
*
* @return non-empty-string * @return non-empty-string
*/ */
public function toISOString(): string public function toISOString(): string
{ {
$string = $this->localDateTime . $this->timeZoneOffset; $time = $this->localDateTime->getTime();
$hour = $time->getHour();
$minute = $time->getMinute();
$second = $time->getSecond();
$nano = $time->getNano();
$string = $this->localDateTime->getDate()
. 'T'
. ($hour < 10 ? '0' . $hour : $hour)
. ':'
. ($minute < 10 ? '0' . $minute : $minute)
. ':'
. ($second < 10 ? '0' . $second : $second)
. ($nano !== 0 ? '.' . rtrim(str_pad((string) $nano, 9, '0', STR_PAD_LEFT), '0') : '')
. $this->timeZoneOffset;
if ($this->timeZone instanceof TimeZoneRegion) { if ($this->timeZone instanceof TimeZoneRegion) {
$string .= '[' . $this->timeZone . ']'; $string .= '[' . $this->timeZone . ']';
+7 -4
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@@ -573,11 +573,11 @@ class InstantTest extends AbstractTestCase
public static function providerGetIntervalTo(): array public static function providerGetIntervalTo(): array
{ {
return [ return [
[1672567200, 0, 1672567200, 0, '2023-01-01T10:00Z/2023-01-01T10:00Z'], [1672567200, 0, 1672567200, 0, '2023-01-01T10:00:00Z/2023-01-01T10:00:00Z'],
[1672567200, 0, 1672567210, 0, '2023-01-01T10:00Z/2023-01-01T10:00:10Z'], [1672567200, 0, 1672567210, 0, '2023-01-01T10:00:00Z/2023-01-01T10:00:10Z'],
[1672567200, 1000000, 1672567210, 2000000, '2023-01-01T10:00:00.001Z/2023-01-01T10:00:10.002Z'], [1672567200, 1000000, 1672567210, 2000000, '2023-01-01T10:00:00.001Z/2023-01-01T10:00:10.002Z'],
[1672567200, 1, 1672567200, 9, '2023-01-01T10:00:00.000000001Z/2023-01-01T10:00:00.000000009Z'], [1672567200, 1, 1672567200, 9, '2023-01-01T10:00:00.000000001Z/2023-01-01T10:00:00.000000009Z'],
[1672567200, 0, 1672653600, 0, '2023-01-01T10:00Z/2023-01-02T10:00Z'], [1672567200, 0, 1672653600, 0, '2023-01-01T10:00:00Z/2023-01-02T10:00:00Z'],
]; ];
} }
@@ -648,11 +648,14 @@ class InstantTest extends AbstractTestCase
[-2000000000, 0, '1906-08-16T20:26:40Z'], [-2000000000, 0, '1906-08-16T20:26:40Z'],
[-1, 0, '1969-12-31T23:59:59Z'], [-1, 0, '1969-12-31T23:59:59Z'],
[-1, 123, '1969-12-31T23:59:59.000000123Z'], [-1, 123, '1969-12-31T23:59:59.000000123Z'],
[0, 0, '1970-01-01T00:00Z'], [0, 0, '1970-01-01T00:00:00Z'],
[0, 123456, '1970-01-01T00:00:00.000123456Z'], [0, 123456, '1970-01-01T00:00:00.000123456Z'],
[1, 0, '1970-01-01T00:00:01Z'], [1, 0, '1970-01-01T00:00:01Z'],
[1, 123456789, '1970-01-01T00:00:01.123456789Z'], [1, 123456789, '1970-01-01T00:00:01.123456789Z'],
[2000000000, 0, '2033-05-18T03:33:20Z'], [2000000000, 0, '2033-05-18T03:33:20Z'],
// whole minute and whole hour must keep the full ":00" seconds (RFC 3339 section 5.6)
[1700000040, 0, '2023-11-14T22:14:00Z'],
[1700002800, 0, '2023-11-14T23:00:00Z'],
]; ];
} }
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@@ -222,7 +222,7 @@ class IntervalTest extends AbstractTestCase
$interval2 = Interval::of(Instant::of(300000), Instant::of(400000)); $interval2 = Interval::of(Instant::of(300000), Instant::of(400000));
$this->expectException(DateTimeException::class); $this->expectException(DateTimeException::class);
$this->expectExceptionMessage('Intervals "1970-01-02T03:46:40Z/1970-01-03T07:33:20Z" and "1970-01-04T11:20Z/1970-01-05T15:06:40Z" do not intersect.'); $this->expectExceptionMessage('Intervals "1970-01-02T03:46:40Z/1970-01-03T07:33:20Z" and "1970-01-04T11:20:00Z/1970-01-05T15:06:40Z" do not intersect.');
$interval1->getIntersectionWith($interval2); $interval1->getIntersectionWith($interval2);
} }
+33 -30
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@@ -436,7 +436,7 @@ class ZonedDateTimeTest extends AbstractTestCase
{ {
return [ return [
['2018-07-21 14:09:10.23456', 'America/Los_Angeles', '2018-07-21T14:09:10.23456-07:00[America/Los_Angeles]'], ['2018-07-21 14:09:10.23456', 'America/Los_Angeles', '2018-07-21T14:09:10.23456-07:00[America/Los_Angeles]'],
['2019-01-21 17:59', 'America/Los_Angeles', '2019-01-21T17:59-08:00[America/Los_Angeles]'], ['2019-01-21 17:59', 'America/Los_Angeles', '2019-01-21T17:59:00-08:00[America/Los_Angeles]'],
['2019-01-23 09:10:11.123', '+05:30', '2019-01-23T09:10:11.123+05:30'], ['2019-01-23 09:10:11.123', '+05:30', '2019-01-23T09:10:11.123+05:30'],
]; ];
} }
@@ -753,12 +753,12 @@ class ZonedDateTimeTest extends AbstractTestCase
['2000-01-01T12:34:56.123456789-08:00[America/Los_Angeles]', 25, '2000-06-24T12:34:56.123456789-07:00[America/Los_Angeles]'], ['2000-01-01T12:34:56.123456789-08:00[America/Los_Angeles]', 25, '2000-06-24T12:34:56.123456789-07:00[America/Los_Angeles]'],
// https://github.com/brick/date-time/issues/115 // https://github.com/brick/date-time/issues/115
['2025-03-23T01:00+01:00[Europe/Prague]', 1, '2025-03-30T01:00+01:00[Europe/Prague]'], ['2025-03-23T01:00+01:00[Europe/Prague]', 1, '2025-03-30T01:00:00+01:00[Europe/Prague]'],
['2025-03-23T01:30+01:00[Europe/Prague]', 1, '2025-03-30T01:30+01:00[Europe/Prague]'], ['2025-03-23T01:30+01:00[Europe/Prague]', 1, '2025-03-30T01:30:00+01:00[Europe/Prague]'],
['2025-03-23T02:00+01:00[Europe/Prague]', 1, '2025-03-30T03:00+02:00[Europe/Prague]'], ['2025-03-23T02:00+01:00[Europe/Prague]', 1, '2025-03-30T03:00:00+02:00[Europe/Prague]'],
['2025-03-23T02:30+01:00[Europe/Prague]', 1, '2025-03-30T03:30+02:00[Europe/Prague]'], ['2025-03-23T02:30+01:00[Europe/Prague]', 1, '2025-03-30T03:30:00+02:00[Europe/Prague]'],
['2025-03-23T03:00+01:00[Europe/Prague]', 1, '2025-03-30T03:00+02:00[Europe/Prague]'], ['2025-03-23T03:00+01:00[Europe/Prague]', 1, '2025-03-30T03:00:00+02:00[Europe/Prague]'],
['2025-03-23T03:30+01:00[Europe/Prague]', 1, '2025-03-30T03:30+02:00[Europe/Prague]'], ['2025-03-23T03:30+01:00[Europe/Prague]', 1, '2025-03-30T03:30:00+02:00[Europe/Prague]'],
]; ];
} }
@@ -782,12 +782,12 @@ class ZonedDateTimeTest extends AbstractTestCase
['2000-04-03T12:34:56.123456789-07:00[America/Los_Angeles]', -2, '2000-04-01T12:34:56.123456789-08:00[America/Los_Angeles]'], ['2000-04-03T12:34:56.123456789-07:00[America/Los_Angeles]', -2, '2000-04-01T12:34:56.123456789-08:00[America/Los_Angeles]'],
// https://github.com/brick/date-time/issues/115 // https://github.com/brick/date-time/issues/115
['2025-03-29T01:00+01:00[Europe/Prague]', 1, '2025-03-30T01:00+01:00[Europe/Prague]'], ['2025-03-29T01:00+01:00[Europe/Prague]', 1, '2025-03-30T01:00:00+01:00[Europe/Prague]'],
['2025-03-29T01:30+01:00[Europe/Prague]', 1, '2025-03-30T01:30+01:00[Europe/Prague]'], ['2025-03-29T01:30+01:00[Europe/Prague]', 1, '2025-03-30T01:30:00+01:00[Europe/Prague]'],
['2025-03-29T02:00+01:00[Europe/Prague]', 1, '2025-03-30T03:00+02:00[Europe/Prague]'], ['2025-03-29T02:00+01:00[Europe/Prague]', 1, '2025-03-30T03:00:00+02:00[Europe/Prague]'],
['2025-03-29T02:30+01:00[Europe/Prague]', 1, '2025-03-30T03:30+02:00[Europe/Prague]'], ['2025-03-29T02:30+01:00[Europe/Prague]', 1, '2025-03-30T03:30:00+02:00[Europe/Prague]'],
['2025-03-29T03:00+01:00[Europe/Prague]', 1, '2025-03-30T03:00+02:00[Europe/Prague]'], ['2025-03-29T03:00+01:00[Europe/Prague]', 1, '2025-03-30T03:00:00+02:00[Europe/Prague]'],
['2025-03-29T03:30+01:00[Europe/Prague]', 1, '2025-03-30T03:30+02:00[Europe/Prague]'], ['2025-03-29T03:30+01:00[Europe/Prague]', 1, '2025-03-30T03:30:00+02:00[Europe/Prague]'],
]; ];
} }
@@ -815,12 +815,12 @@ class ZonedDateTimeTest extends AbstractTestCase
['2000-04-02T04:12:34.123456789-07:00[America/Los_Angeles]', 1, '2000-04-02T05:12:34.123456789-07:00[America/Los_Angeles]'], ['2000-04-02T04:12:34.123456789-07:00[America/Los_Angeles]', 1, '2000-04-02T05:12:34.123456789-07:00[America/Los_Angeles]'],
// https://github.com/brick/date-time/issues/115 // https://github.com/brick/date-time/issues/115
['2025-03-29T01:00+01:00[Europe/Prague]', 24, '2025-03-30T01:00+01:00[Europe/Prague]'], ['2025-03-29T01:00+01:00[Europe/Prague]', 24, '2025-03-30T01:00:00+01:00[Europe/Prague]'],
['2025-03-29T01:30+01:00[Europe/Prague]', 24, '2025-03-30T01:30+01:00[Europe/Prague]'], ['2025-03-29T01:30+01:00[Europe/Prague]', 24, '2025-03-30T01:30:00+01:00[Europe/Prague]'],
['2025-03-29T02:00+01:00[Europe/Prague]', 24, '2025-03-30T03:00+02:00[Europe/Prague]'], ['2025-03-29T02:00+01:00[Europe/Prague]', 24, '2025-03-30T03:00:00+02:00[Europe/Prague]'],
['2025-03-29T02:30+01:00[Europe/Prague]', 24, '2025-03-30T03:30+02:00[Europe/Prague]'], ['2025-03-29T02:30+01:00[Europe/Prague]', 24, '2025-03-30T03:30:00+02:00[Europe/Prague]'],
['2025-03-29T03:00+01:00[Europe/Prague]', 24, '2025-03-30T04:00+02:00[Europe/Prague]'], ['2025-03-29T03:00+01:00[Europe/Prague]', 24, '2025-03-30T04:00:00+02:00[Europe/Prague]'],
['2025-03-29T03:30+01:00[Europe/Prague]', 24, '2025-03-30T04:30+02:00[Europe/Prague]'], ['2025-03-29T03:30+01:00[Europe/Prague]', 24, '2025-03-30T04:30:00+02:00[Europe/Prague]'],
]; ];
} }
@@ -848,10 +848,10 @@ class ZonedDateTimeTest extends AbstractTestCase
['2000-04-02T03:01:01.654321-07:00[America/Los_Angeles]', 1, '2000-04-02T03:02:01.654321-07:00[America/Los_Angeles]'], ['2000-04-02T03:01:01.654321-07:00[America/Los_Angeles]', 1, '2000-04-02T03:02:01.654321-07:00[America/Los_Angeles]'],
// https://github.com/brick/date-time/issues/115 // https://github.com/brick/date-time/issues/115
['2025-03-30T01:30+01:00[Europe/Prague]', 50, '2025-03-30T03:20+02:00[Europe/Prague]'], ['2025-03-30T01:30:00+01:00[Europe/Prague]', 50, '2025-03-30T03:20:00+02:00[Europe/Prague]'],
['2025-03-30T01:30+01:00[Europe/Prague]', 100, '2025-03-30T04:10+02:00[Europe/Prague]'], ['2025-03-30T01:30:00+01:00[Europe/Prague]', 100, '2025-03-30T04:10:00+02:00[Europe/Prague]'],
['2025-03-30T03:20+02:00[Europe/Prague]', -50, '2025-03-30T01:30+01:00[Europe/Prague]'], ['2025-03-30T03:20:00+02:00[Europe/Prague]', -50, '2025-03-30T01:30:00+01:00[Europe/Prague]'],
['2025-03-30T04:10+02:00[Europe/Prague]', -100, '2025-03-30T01:30+01:00[Europe/Prague]'], ['2025-03-30T04:10:00+02:00[Europe/Prague]', -100, '2025-03-30T01:30:00+01:00[Europe/Prague]'],
]; ];
} }
@@ -878,10 +878,10 @@ class ZonedDateTimeTest extends AbstractTestCase
['2000-04-02T03:00:01.654321-07:00[America/Los_Angeles]', 1, '2000-04-02T03:00:02.654321-07:00[America/Los_Angeles]'], ['2000-04-02T03:00:01.654321-07:00[America/Los_Angeles]', 1, '2000-04-02T03:00:02.654321-07:00[America/Los_Angeles]'],
// https://github.com/brick/date-time/issues/115 // https://github.com/brick/date-time/issues/115
['2025-03-30T01:30+01:00[Europe/Prague]', 3000, '2025-03-30T03:20+02:00[Europe/Prague]'], ['2025-03-30T01:30:00+01:00[Europe/Prague]', 3000, '2025-03-30T03:20:00+02:00[Europe/Prague]'],
['2025-03-30T01:30+01:00[Europe/Prague]', 6000, '2025-03-30T04:10+02:00[Europe/Prague]'], ['2025-03-30T01:30:00+01:00[Europe/Prague]', 6000, '2025-03-30T04:10:00+02:00[Europe/Prague]'],
['2025-03-30T03:20+02:00[Europe/Prague]', -3000, '2025-03-30T01:30+01:00[Europe/Prague]'], ['2025-03-30T03:20:00+02:00[Europe/Prague]', -3000, '2025-03-30T01:30:00+01:00[Europe/Prague]'],
['2025-03-30T04:10+02:00[Europe/Prague]', -6000, '2025-03-30T01:30+01:00[Europe/Prague]'], ['2025-03-30T04:10:00+02:00[Europe/Prague]', -6000, '2025-03-30T01:30:00+01:00[Europe/Prague]'],
]; ];
} }
@@ -1086,6 +1086,9 @@ class ZonedDateTimeTest extends AbstractTestCase
return [ return [
['2000-01-20T12:34:56.123456789', 'America/Los_Angeles', '2000-01-20T12:34:56.123456789-08:00[America/Los_Angeles]'], ['2000-01-20T12:34:56.123456789', 'America/Los_Angeles', '2000-01-20T12:34:56.123456789-08:00[America/Los_Angeles]'],
['2000-01-20T12:34:56.123456789', '-07:00', '2000-01-20T12:34:56.123456789-07:00'], ['2000-01-20T12:34:56.123456789', '-07:00', '2000-01-20T12:34:56.123456789-07:00'],
// whole minute and whole hour must keep the full ":00" seconds (RFC 3339 section 5.6)
['2000-01-20T12:34', '-07:00', '2000-01-20T12:34:00-07:00'],
['2000-01-20T12:00', 'America/Los_Angeles', '2000-01-20T12:00:00-08:00[America/Los_Angeles]'],
]; ];
} }
@@ -1121,13 +1124,13 @@ class ZonedDateTimeTest extends AbstractTestCase
public static function providerGetIntervalTo(): array public static function providerGetIntervalTo(): array
{ {
return [ return [
['2023-01-01T10:00:00Z', '2023-01-01T10:00:00Z', '2023-01-01T10:00Z/2023-01-01T10:00Z'], ['2023-01-01T10:00:00Z', '2023-01-01T10:00:00Z', '2023-01-01T10:00:00Z/2023-01-01T10:00:00Z'],
['2023-01-01T10:00:00Z', '2023-01-01T10:00:10Z', '2023-01-01T10:00Z/2023-01-01T10:00:10Z'], ['2023-01-01T10:00:00Z', '2023-01-01T10:00:10Z', '2023-01-01T10:00:00Z/2023-01-01T10:00:10Z'],
['2023-01-01T10:00:00.001Z', '2023-01-01T10:00:10.002Z', '2023-01-01T10:00:00.001Z/2023-01-01T10:00:10.002Z'], ['2023-01-01T10:00:00.001Z', '2023-01-01T10:00:10.002Z', '2023-01-01T10:00:00.001Z/2023-01-01T10:00:10.002Z'],
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]; ];
} }