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Datetime created from negative float timestamp is not monotonic (fraction part is added instead of substracted) #7758

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@mvorisek

Description

@mvorisek

Description

The following code:

foreach ([0.4,0, -0.4, -1, -1.4]as$ts) {$date =newDateTime('@' .$ts);print_r($date);}

https://3v4l.org/EWpSj

Diff of current output vs expected:

 DateTime Object (     [date] => 1970-01-01 00:00:00.400000     [timezone_type] => 1     [timezone] => +00:00 ) DateTime Object (     [date] => 1970-01-01 00:00:00.000000     [timezone_type] => 1     [timezone] => +00:00 ) DateTime Object (-    [date] => 1970-01-01 00:00:00.400000+    [date] => 1969-12-31 23:59:59.600000     [timezone_type] => 1     [timezone] => +00:00 ) DateTime Object (     [date] => 1969-12-31 23:59:59.000000     [timezone_type] => 1     [timezone] => +00:00 ) DateTime Object (-    [date] => 1969-12-31 23:59:59.400000+    [date] => 1969-12-31 23:59:58.600000     [timezone_type] => 1     [timezone] => +00:00 )

PHP Version

present since PHP 8.0, should be fixed starting this version

it seems the issue is present only when TS is parsed,getTimestamp /format('u') seems correct across all PHP versions -https://3v4l.org/CjJLf

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