Fixed a problem where usec was carry up

If round to the fractional part of a timestamp, a carry will occur in cases
such as 999 999 9. In that case, set usec to 0 and add 1 to sec.

Author: SakiTakamachi

ext/date/php_date.c

@@ -2540,6 +2540,11 @@ PHPAPI bool php_date_initialize_from_ts_double(php_date_obj *dateobj, double ts)
 	sec = (zend_long)sec_dval;
 	usec = (int) round(fmod(ts, 1) * 1000000);
 
+	if (UNEXPECTED(usec >= 1000000)) {
+		sec++;
+		usec = 0;
+	}
+
 	if (UNEXPECTED(usec < 0)) {
 		if (UNEXPECTED(sec == TIMELIB_LONG_MIN)) {
 			zend_argument_error(

ext/date/tests/gh14383.phpt

@@ -0,0 +1,39 @@
+--TEST--
+Bug GH-14383 (DateTime::createFromTimestamp overflowed microseconds value)
+--INI--
+date.timezone=UTC
+--FILE--
+<?php
+$cases = [
+    [0.999_999_0, '0.999_999_0'],
+    [0.999_999_1, '0.999_999_1'],
+    [0.999_999_8, '0.999_999_8'],
+    [0.999_999_9, '0.999_999_9'],
+    [1.000_000_0, '1.000_000_0'],
+    [1.000_000_1, '1.000_000_1'],
+    [1.000_000_8, '1.000_000_8'],
+    [1.000_000_9, '1.000_000_9'],
+    [1.000_001_0, '1.000_001_0'],
+    [1.000_001_1, '1.000_001_0'],
+    [1.000_001_8, '1.000_001_8'],
+    [1.000_001_9, '1.000_001_9'],
+];
+
+foreach ($cases as [$usec, $label]) {
+    echo "{$label}: ";
+    echo DateTime::createFromTimestamp($usec)->format('s.u'), "\n";
+}
+?>
+--EXPECT--
+0.999_999_0: 00.999999
+0.999_999_1: 00.999999
+0.999_999_8: 01.000000
+0.999_999_9: 01.000000
+1.000_000_0: 01.000000
+1.000_000_1: 01.000000
+1.000_000_8: 01.000001
+1.000_000_9: 01.000001
+1.000_001_0: 01.000001
+1.000_001_0: 01.000001
+1.000_001_8: 01.000002
+1.000_001_9: 01.000002