diff --git a/src/BSON/UTCDateTime.c b/src/BSON/UTCDateTime.c
index 8cb153f84..8a732bfbc 100644
--- a/src/BSON/UTCDateTime.c
+++ b/src/BSON/UTCDateTime.c
@@ -104,6 +104,35 @@ static bool php_phongo_utcdatetime_init_from_date(php_phongo_utcdatetime_t* inte
 	return true;
 }
 
+static bool php_phongo_utcdatetime_init_from_object(php_phongo_utcdatetime_t* intern, zend_object* object)
+{
+	if (instanceof_function(object->ce, php_date_get_interface_ce())) {
+		php_phongo_utcdatetime_init_from_date(intern, php_date_obj_from_obj(object));
+
+		return true;
+	}
+
+	if (instanceof_function(object->ce, php_phongo_int64_ce)) {
+		php_phongo_utcdatetime_init(intern, php_int64_fetch_object(object)->integer);
+
+		return true;
+	}
+
+	phongo_throw_exception(PHONGO_ERROR_INVALID_ARGUMENT, "Expected instance of %s or %s, %s given", ZSTR_VAL(php_date_get_interface_ce()->name), ZSTR_VAL(php_phongo_int64_ce->name), ZSTR_VAL(object->ce->name));
+
+	return false;
+}
+
+static bool php_phongo_utcdatetime_init_from_double(php_phongo_utcdatetime_t* intern, double milliseconds)
+{
+	char tmp[24];
+	int  tmp_len;
+
+	tmp_len = snprintf(tmp, sizeof(tmp), "%.0f", milliseconds > 0 ? floor(milliseconds) : ceil(milliseconds));
+
+	return php_phongo_utcdatetime_init_from_string(intern, tmp, tmp_len);
+}
+
 static HashTable* php_phongo_utcdatetime_get_properties_hash(phongo_compat_object_handler_type* object, bool is_temp)
 {
 	php_phongo_utcdatetime_t* intern;
@@ -179,36 +208,27 @@ static PHP_METHOD(MongoDB_BSON_UTCDateTime, __construct)
 		return;
 	}
 
-	if (Z_TYPE_P(milliseconds) == IS_OBJECT) {
-		if (instanceof_function(Z_OBJCE_P(milliseconds), php_date_get_interface_ce())) {
-			php_phongo_utcdatetime_init_from_date(intern, Z_PHPDATE_P(milliseconds));
-		} else {
-			phongo_throw_exception(PHONGO_ERROR_INVALID_ARGUMENT, "Expected instance of DateTimeInterface, %s given", ZSTR_VAL(Z_OBJCE_P(milliseconds)->name));
-		}
-		return;
-	}
-
-	if (Z_TYPE_P(milliseconds) == IS_LONG) {
-		php_phongo_utcdatetime_init(intern, Z_LVAL_P(milliseconds));
-		return;
-	}
+	switch (Z_TYPE_P(milliseconds)) {
+		case IS_OBJECT:
+			php_phongo_utcdatetime_init_from_object(intern, Z_OBJ_P(milliseconds));
+			return;
 
-	if (Z_TYPE_P(milliseconds) == IS_DOUBLE) {
-		char tmp[24];
-		int  tmp_len;
+		case IS_LONG:
+			php_phongo_utcdatetime_init(intern, Z_LVAL_P(milliseconds));
+			return;
 
-		tmp_len = snprintf(tmp, sizeof(tmp), "%.0f", Z_DVAL_P(milliseconds) > 0 ? floor(Z_DVAL_P(milliseconds)) : ceil(Z_DVAL_P(milliseconds)));
+		case IS_DOUBLE:
+			php_phongo_utcdatetime_init_from_double(intern, Z_DVAL_P(milliseconds));
+			return;
 
-		php_phongo_utcdatetime_init_from_string(intern, tmp, tmp_len);
-		return;
-	}
+		case IS_STRING:
+			php_error_docref(NULL, E_DEPRECATED, "Creating a %s instance with a string is deprecated and will be removed in ext-mongodb 2.0", ZSTR_VAL(php_phongo_utcdatetime_ce->name));
 
-	if (Z_TYPE_P(milliseconds) != IS_STRING) {
-		phongo_throw_exception(PHONGO_ERROR_INVALID_ARGUMENT, "Expected integer or string, %s given", PHONGO_ZVAL_CLASS_OR_TYPE_NAME_P(milliseconds));
-		return;
+			php_phongo_utcdatetime_init_from_string(intern, Z_STRVAL_P(milliseconds), Z_STRLEN_P(milliseconds));
+			return;
 	}
 
-	php_phongo_utcdatetime_init_from_string(intern, Z_STRVAL_P(milliseconds), Z_STRLEN_P(milliseconds));
+	phongo_throw_exception(PHONGO_ERROR_INVALID_ARGUMENT, "Expected integer or string, %s given", PHONGO_ZVAL_CLASS_OR_TYPE_NAME_P(milliseconds));
 }
 
 static PHP_METHOD(MongoDB_BSON_UTCDateTime, __set_state)
diff --git a/src/BSON/UTCDateTime.stub.php b/src/BSON/UTCDateTime.stub.php
index ac9143a33..575a70641 100644
--- a/src/BSON/UTCDateTime.stub.php
+++ b/src/BSON/UTCDateTime.stub.php
@@ -10,9 +10,9 @@
 final class UTCDateTime implements UTCDateTimeInterface, \JsonSerializable, Type, \Serializable
 {
 #if PHP_VERSION_ID >= 80000
-    final public function __construct(int|string|float|\DateTimeInterface|null $milliseconds = null) {}
+    final public function __construct(int|string|float|\DateTimeInterface|Int64|null $milliseconds = null) {}
 #else
-    /** @param int|string|float|\DateTimeInterface|null $milliseconds */
+    /** @param int|string|float|\DateTimeInterface|Int64|null $milliseconds */
     final public function __construct($milliseconds = null) {}
 #endif
 
diff --git a/src/BSON/UTCDateTime_arginfo.h b/src/BSON/UTCDateTime_arginfo.h
index df008acda..581ef5fb6 100644
--- a/src/BSON/UTCDateTime_arginfo.h
+++ b/src/BSON/UTCDateTime_arginfo.h
@@ -1,9 +1,9 @@
 /* This is a generated file, edit the .stub.php file instead.
- * Stub hash: 2b7ac84585a74a210af3cb2061541977cc309e2d */
+ * Stub hash: 11f44ab06f1806ec74876a6034c6fd75672fe2a8 */
 
 #if PHP_VERSION_ID >= 80000
 ZEND_BEGIN_ARG_INFO_EX(arginfo_class_MongoDB_BSON_UTCDateTime___construct, 0, 0, 0)
-	ZEND_ARG_OBJ_TYPE_MASK(0, milliseconds, DateTimeInterface, MAY_BE_LONG|MAY_BE_STRING|MAY_BE_DOUBLE|MAY_BE_NULL, "null")
+	ZEND_ARG_OBJ_TYPE_MASK(0, milliseconds, DateTimeInterface|MongoDB\\BSON\\Int64, MAY_BE_LONG|MAY_BE_STRING|MAY_BE_DOUBLE|MAY_BE_NULL, "null")
 ZEND_END_ARG_INFO()
 #endif
 
diff --git a/tests/bson/bson-fromPHP-003.phpt b/tests/bson/bson-fromPHP-003.phpt
index 38df0c17e..85fc850b2 100644
--- a/tests/bson/bson-fromPHP-003.phpt
+++ b/tests/bson/bson-fromPHP-003.phpt
@@ -12,8 +12,8 @@ class MyDocument {
 }
 
 $tests = array(
-    array(new MongoDB\BSON\UTCDateTime('1416445411987')),
-    array('x' => new MongoDB\BSON\UTCDateTime('1416445411987')),
+    array(new MongoDB\BSON\UTCDateTime(new MongoDB\BSON\Int64('1416445411987'))),
+    array('x' => new MongoDB\BSON\UTCDateTime(new MongoDB\BSON\Int64('1416445411987'))),
     array(new MyDocument),
     array('x' => new MyDocument),
 );
diff --git a/tests/bson/bson-fromPHP_error-003.phpt b/tests/bson/bson-fromPHP_error-003.phpt
index b6f355ec8..195dccf0a 100644
--- a/tests/bson/bson-fromPHP_error-003.phpt
+++ b/tests/bson/bson-fromPHP_error-003.phpt
@@ -16,7 +16,7 @@ $tests = array(
     new MongoDB\BSON\ObjectId,
     new MongoDB\BSON\Regex('regexp', 'i'),
     new MongoDB\BSON\Timestamp(1234, 5678),
-    new MongoDB\BSON\UTCDateTime('1416445411987'),
+    new MongoDB\BSON\UTCDateTime(new MongoDB\BSON\Int64('1416445411987')),
 );
 
 foreach ($tests as $document) {
diff --git a/tests/bson/bson-toPHP-004.phpt b/tests/bson/bson-toPHP-004.phpt
index 1bf4f1b81..c8e5497f8 100644
--- a/tests/bson/bson-toPHP-004.phpt
+++ b/tests/bson/bson-toPHP-004.phpt
@@ -29,7 +29,7 @@ $tests = [
     new MongoDB\BSON\ObjectId('586c18d86118fd6c9012dec1'),
     new MongoDB\BSON\Regex('foo'),
     new MongoDB\BSON\Timestamp(1234, 5678),
-    new MongoDB\BSON\UTCDateTime('1483479256924'),
+    new MongoDB\BSON\UTCDateTime(new MongoDB\BSON\Int64('1483479256924')),
 ];
 
 foreach ($tests as $value) {
diff --git a/tests/bson/bson-utcdatetime-001.phpt b/tests/bson/bson-utcdatetime-001.phpt
index 73bf8922e..7175e4004 100644
--- a/tests/bson/bson-utcdatetime-001.phpt
+++ b/tests/bson/bson-utcdatetime-001.phpt
@@ -11,7 +11,7 @@ require_once __DIR__ . "/../utils/basic.inc";
 
 $manager = create_test_manager();
 
-$utcdatetime = new MongoDB\BSON\UTCDateTime("1416445411987");
+$utcdatetime = new MongoDB\BSON\UTCDateTime(new MongoDB\BSON\Int64('1416445411987'));
 
 $bulk = new MongoDB\Driver\BulkWrite();
 $bulk->insert(array('_id' => 1, 'x' => $utcdatetime));
diff --git a/tests/bson/bson-utcdatetime-002.phpt b/tests/bson/bson-utcdatetime-002.phpt
index 6da9fd291..27db72e4c 100644
--- a/tests/bson/bson-utcdatetime-002.phpt
+++ b/tests/bson/bson-utcdatetime-002.phpt
@@ -3,7 +3,7 @@ MongoDB\BSON\UTCDateTime debug handler
 --FILE--
 <?php
 
-$utcdatetime = new MongoDB\BSON\UTCDateTime('1416445411987');
+$utcdatetime = new MongoDB\BSON\UTCDateTime(new MongoDB\BSON\Int64('1416445411987'));
 
 var_dump($utcdatetime);
 
@@ -13,6 +13,6 @@ var_dump($utcdatetime);
 --EXPECTF--
 object(MongoDB\BSON\UTCDateTime)#%d (%d) {
   ["milliseconds"]=>
-  %rint\(|string\(13\) "|%r1416445411987%r"|\)%r
+  string(13) "1416445411987"
 }
 ===DONE===
diff --git a/tests/bson/bson-utcdatetime-008.phpt b/tests/bson/bson-utcdatetime-008.phpt
new file mode 100644
index 000000000..d39e02088
--- /dev/null
+++ b/tests/bson/bson-utcdatetime-008.phpt
@@ -0,0 +1,21 @@
+--TEST--
+MongoDB\BSON\UTCDateTime construction from 64-bit integer as string
+--FILE--
+<?php
+
+require_once __DIR__ . '/../utils/basic.inc';
+
+$utcdatetime = new MongoDB\BSON\UTCDateTime('1416445411987');
+
+var_dump($utcdatetime);
+
+?>
+===DONE===
+<?php exit(0); ?>
+--EXPECTF--
+Deprecated: MongoDB\BSON\UTCDateTime::__construct(): Creating a MongoDB\BSON\UTCDateTime instance with a string is deprecated and will be removed in ext-mongodb 2.0 in %s
+object(MongoDB\BSON\UTCDateTime)#%d (%d) {
+  ["milliseconds"]=>
+  string(13) "1416445411987"
+}
+===DONE===
diff --git a/tests/bson/bson-utcdatetime-009.phpt b/tests/bson/bson-utcdatetime-009.phpt
new file mode 100644
index 000000000..f17bc0e35
--- /dev/null
+++ b/tests/bson/bson-utcdatetime-009.phpt
@@ -0,0 +1,20 @@
+--TEST--
+MongoDB\BSON\UTCDateTime construction from Int64 object
+--FILE--
+<?php
+
+require_once __DIR__ . '/../utils/basic.inc';
+
+$utcdatetime = new MongoDB\BSON\UTCDateTime(new MongoDB\BSON\Int64('1416445411987'));
+
+var_dump($utcdatetime);
+
+?>
+===DONE===
+<?php exit(0); ?>
+--EXPECTF--
+object(MongoDB\BSON\UTCDateTime)#%d (%d) {
+  ["milliseconds"]=>
+  string(13) "1416445411987"
+}
+===DONE===
diff --git a/tests/bson/bson-utcdatetime-clone-001.phpt b/tests/bson/bson-utcdatetime-clone-001.phpt
index 1a516c367..ac7e05111 100644
--- a/tests/bson/bson-utcdatetime-clone-001.phpt
+++ b/tests/bson/bson-utcdatetime-clone-001.phpt
@@ -8,7 +8,7 @@ MongoDB\BSON\UTCDateTime can be cloned (PHP < 8.2)
 
 require_once __DIR__ . "/../utils/basic.inc";
 
-$utcdatetime = new MongoDB\BSON\UTCDateTime("1416445411987");
+$utcdatetime = new MongoDB\BSON\UTCDateTime(new MongoDB\BSON\Int64('1416445411987'));
 
 $clone = clone $utcdatetime;
 
diff --git a/tests/bson/bson-utcdatetime-clone-002.phpt b/tests/bson/bson-utcdatetime-clone-002.phpt
index a7834ae59..b9e8922c1 100644
--- a/tests/bson/bson-utcdatetime-clone-002.phpt
+++ b/tests/bson/bson-utcdatetime-clone-002.phpt
@@ -8,7 +8,7 @@ MongoDB\BSON\UTCDateTime can be cloned (PHP >= 8.2)
 
 require_once __DIR__ . "/../utils/basic.inc";
 
-$utcdatetime = new MongoDB\BSON\UTCDateTime("1416445411987");
+$utcdatetime = new MongoDB\BSON\UTCDateTime(new MongoDB\BSON\Int64('1416445411987'));
 
 $clone = clone $utcdatetime;
 
diff --git a/tests/bson/bson-utcdatetime-get_properties-001.phpt b/tests/bson/bson-utcdatetime-get_properties-001.phpt
index ab4dd66d9..572884228 100644
--- a/tests/bson/bson-utcdatetime-get_properties-001.phpt
+++ b/tests/bson/bson-utcdatetime-get_properties-001.phpt
@@ -3,7 +3,7 @@ MongoDB\BSON\UTCDateTime get_properties handler (get_object_vars)
 --FILE--
 <?php
 
-$utcdatetime = new MongoDB\BSON\UTCDateTime('1416445411987');
+$utcdatetime = new MongoDB\BSON\UTCDateTime(new MongoDB\BSON\Int64('1416445411987'));
 
 var_dump(get_object_vars($utcdatetime));
 
diff --git a/tests/bson/bson-utcdatetime-get_properties-002.phpt b/tests/bson/bson-utcdatetime-get_properties-002.phpt
index bcb4aee85..e274bf02a 100644
--- a/tests/bson/bson-utcdatetime-get_properties-002.phpt
+++ b/tests/bson/bson-utcdatetime-get_properties-002.phpt
@@ -3,7 +3,7 @@ MongoDB\BSON\UTCDateTime get_properties handler (foreach)
 --FILE--
 <?php
 
-$utcdatetime = new MongoDB\BSON\UTCDateTime('1416445411987');
+$utcdatetime = new MongoDB\BSON\UTCDateTime(new MongoDB\BSON\Int64('1416445411987'));
 
 foreach ($utcdatetime as $key => $value) {
     var_dump($key);
diff --git a/tests/bson/bson-utcdatetime-int-size-001.phpt b/tests/bson/bson-utcdatetime-int-size-001.phpt
deleted file mode 100644
index be2eaf9d7..000000000
--- a/tests/bson/bson-utcdatetime-int-size-001.phpt
+++ /dev/null
@@ -1,30 +0,0 @@
---TEST--
-MongoDB\BSON\UTCDateTime integer parsing from string
---INI--
-date.timezone=UTC
-error_reporting=-1
-dislay_errors=1
---FILE--
-<?php
-
-$utcdatetime = new MongoDB\BSON\UTCDateTime('1416445411987');
-var_dump($utcdatetime);
-var_dump($utcdatetime->toDateTime());
-
-?>
-===DONE===
-<?php exit(0); ?>
---EXPECTF--
-object(MongoDB\BSON\UTCDateTime)#%d (1) {
-  ["milliseconds"]=>
-  string(13) "1416445411987"
-}
-object(DateTime)#%d (3) {
-  ["date"]=>
-  string(26) "2014-11-20 01:03:31.987000"
-  ["timezone_type"]=>
-  int(1)
-  ["timezone"]=>
-  string(6) "+00:00"
-}
-===DONE===
diff --git a/tests/bson/bson-utcdatetime-int-size-002.phpt b/tests/bson/bson-utcdatetime-int-size-002.phpt
deleted file mode 100644
index d303c9574..000000000
--- a/tests/bson/bson-utcdatetime-int-size-002.phpt
+++ /dev/null
@@ -1,32 +0,0 @@
---TEST--
-MongoDB\BSON\UTCDateTime integer parsing from number (64-bit)
---SKIPIF--
-<?php if (8 !== PHP_INT_SIZE) { die('skip Only for 64-bit platform'); } ?>
---INI--
-date.timezone=UTC
-error_reporting=-1
-dislay_errors=1
---FILE--
-<?php
-
-$utcdatetime = new MongoDB\BSON\UTCDateTime(1416445411987);
-var_dump($utcdatetime);
-var_dump($utcdatetime->toDateTime());
-
-?>
-===DONE===
-<?php exit(0); ?>
---EXPECTF--
-object(MongoDB\BSON\UTCDateTime)#%d (1) {
-  ["milliseconds"]=>
-  string(13) "1416445411987"
-}
-object(DateTime)#%d (3) {
-  ["date"]=>
-  string(26) "2014-11-20 01:03:31.987000"
-  ["timezone_type"]=>
-  int(1)
-  ["timezone"]=>
-  string(6) "+00:00"
-}
-===DONE===
diff --git a/tests/bson/bson-utcdatetime-serialization-003.phpt b/tests/bson/bson-utcdatetime-serialization-003.phpt
index 941057adf..c15c7548f 100644
--- a/tests/bson/bson-utcdatetime-serialization-003.phpt
+++ b/tests/bson/bson-utcdatetime-serialization-003.phpt
@@ -4,9 +4,9 @@ MongoDB\BSON\UTCDateTime serialization (__serialize and __unserialize)
 <?php
 
 $tests = [
-    '0',
-    '-1416445411987',
-    '1416445411987',
+    0,
+    new MongoDB\BSON\Int64('-1416445411987'),
+    new MongoDB\BSON\Int64('1416445411987'),
 ];
 
 foreach ($tests as $milliseconds) {
diff --git a/tests/bson/bson-utcdatetime-todatetime-001.phpt b/tests/bson/bson-utcdatetime-todatetime-001.phpt
index 4c34167c5..620e04d58 100644
--- a/tests/bson/bson-utcdatetime-todatetime-001.phpt
+++ b/tests/bson/bson-utcdatetime-todatetime-001.phpt
@@ -5,7 +5,7 @@ date.timezone=America/Los_Angeles
 --FILE--
 <?php
 
-$utcdatetime = new MongoDB\BSON\UTCDateTime("1416445411987");
+$utcdatetime = new MongoDB\BSON\UTCDateTime(new MongoDB\BSON\Int64('1416445411987'));
 $datetime = $utcdatetime->toDateTime();
 var_dump(get_class($datetime));
 var_dump($datetime->format(DATE_RSS));
diff --git a/tests/bson/bson-utcdatetime-todatetime-002.phpt b/tests/bson/bson-utcdatetime-todatetime-002.phpt
index e003cd188..f127f19fe 100644
--- a/tests/bson/bson-utcdatetime-todatetime-002.phpt
+++ b/tests/bson/bson-utcdatetime-todatetime-002.phpt
@@ -5,7 +5,7 @@ date.timezone=UTC
 --FILE--
 <?php
 
-$utcdatetime = new MongoDB\BSON\UTCDateTime("1416445411987");
+$utcdatetime = new MongoDB\BSON\UTCDateTime(new MongoDB\BSON\Int64('1416445411987'));
 $datetime = $utcdatetime->toDateTime();
 var_dump(get_class($datetime));
 echo $datetime->format('U.u'), "\n";
diff --git a/tests/bson/bson-utcdatetime-todatetimeimmutable-001.phpt b/tests/bson/bson-utcdatetime-todatetimeimmutable-001.phpt
index 4d7bd8385..3e17543fb 100644
--- a/tests/bson/bson-utcdatetime-todatetimeimmutable-001.phpt
+++ b/tests/bson/bson-utcdatetime-todatetimeimmutable-001.phpt
@@ -5,7 +5,7 @@ date.timezone=America/Los_Angeles
 --FILE--
 <?php
 
-$utcdatetime = new MongoDB\BSON\UTCDateTime("1416445411987");
+$utcdatetime = new MongoDB\BSON\UTCDateTime(new MongoDB\BSON\Int64('1416445411987'));
 $datetime = $utcdatetime->toDateTimeImmutable();
 var_dump(get_class($datetime));
 var_dump($datetime->format(DATE_RSS));
diff --git a/tests/bson/bson-utcdatetime-todatetimeimmutable-002.phpt b/tests/bson/bson-utcdatetime-todatetimeimmutable-002.phpt
index b959d0bc1..8ccf140c9 100644
--- a/tests/bson/bson-utcdatetime-todatetimeimmutable-002.phpt
+++ b/tests/bson/bson-utcdatetime-todatetimeimmutable-002.phpt
@@ -5,7 +5,7 @@ date.timezone=UTC
 --FILE--
 <?php
 
-$utcdatetime = new MongoDB\BSON\UTCDateTime("1416445411987");
+$utcdatetime = new MongoDB\BSON\UTCDateTime(new MongoDB\BSON\Int64('1416445411987'));
 $datetime = $utcdatetime->toDateTimeImmutable();
 var_dump(get_class($datetime));
 echo $datetime->format('U.u'), "\n";
diff --git a/tests/bson/bson-utcdatetime-tostring-001.phpt b/tests/bson/bson-utcdatetime-tostring-001.phpt
index 53b9fdd82..b88fbe867 100644
--- a/tests/bson/bson-utcdatetime-tostring-001.phpt
+++ b/tests/bson/bson-utcdatetime-tostring-001.phpt
@@ -3,7 +3,7 @@ MongoDB\BSON\UTCDateTime::__toString()
 --FILE--
 <?php
 
-$utcdatetime = new MongoDB\BSON\UTCDateTime("1416445411987");
+$utcdatetime = new MongoDB\BSON\UTCDateTime(new MongoDB\BSON\Int64('1416445411987'));
 var_dump((string) $utcdatetime);
 
 ?>
diff --git a/tests/bson/bson-utcdatetime_error-001.phpt b/tests/bson/bson-utcdatetime_error-001.phpt
index 54534fbf6..7dc837507 100644
--- a/tests/bson/bson-utcdatetime_error-001.phpt
+++ b/tests/bson/bson-utcdatetime_error-001.phpt
@@ -14,5 +14,5 @@ echo throws(function() {
 <?php exit(0); ?>
 --EXPECT--
 OK: Got MongoDB\Driver\Exception\InvalidArgumentException
-Expected instance of DateTimeInterface, stdClass given
+Expected instance of DateTimeInterface or MongoDB\BSON\Int64, stdClass given
 ===DONE===
diff --git a/tests/bson/bson-utcdatetime_error-003.phpt b/tests/bson/bson-utcdatetime_error-003.phpt
index 760eff8b2..6eb1fa741 100644
--- a/tests/bson/bson-utcdatetime_error-003.phpt
+++ b/tests/bson/bson-utcdatetime_error-003.phpt
@@ -26,13 +26,20 @@ echo throws(function() {
 ?>
 ===DONE===
 <?php exit(0); ?>
---EXPECT--
+--EXPECTF--
+Deprecated: MongoDB\BSON\UTCDateTime::__construct(): Creating a MongoDB\BSON\UTCDateTime instance with a string is deprecated and will be removed in ext-mongodb 2.0 in %s
 OK: Got MongoDB\Driver\Exception\InvalidArgumentException
 Error parsing "1234.5678" as 64-bit integer for MongoDB\BSON\UTCDateTime initialization
+
+Deprecated: MongoDB\BSON\UTCDateTime::__construct(): Creating a MongoDB\BSON\UTCDateTime instance with a string is deprecated and will be removed in ext-mongodb 2.0 in %s
 OK: Got MongoDB\Driver\Exception\InvalidArgumentException
 Error parsing "9223372036854775808" as 64-bit integer for MongoDB\BSON\UTCDateTime initialization
+
+Deprecated: MongoDB\BSON\UTCDateTime::__construct(): Creating a MongoDB\BSON\UTCDateTime instance with a string is deprecated and will be removed in ext-mongodb 2.0 in %s
 OK: Got MongoDB\Driver\Exception\InvalidArgumentException
 Error parsing "-9223372036854775809" as 64-bit integer for MongoDB\BSON\UTCDateTime initialization
+
+Deprecated: MongoDB\BSON\UTCDateTime::__construct(): Creating a MongoDB\BSON\UTCDateTime instance with a string is deprecated and will be removed in ext-mongodb 2.0 in %s
 OK: Got MongoDB\Driver\Exception\InvalidArgumentException
 Error parsing "18446744073709551615" as 64-bit integer for MongoDB\BSON\UTCDateTime initialization
 ===DONE===
diff --git a/tests/bson/bson-utcdatetimeinterface-001.phpt b/tests/bson/bson-utcdatetimeinterface-001.phpt
index 26c31b2fb..babd2f798 100644
--- a/tests/bson/bson-utcdatetimeinterface-001.phpt
+++ b/tests/bson/bson-utcdatetimeinterface-001.phpt
@@ -3,7 +3,7 @@ MongoDB\BSON\UTCDateTimeInterface is implemented by MongoDB\BSON\UTCDateTime
 --FILE--
 <?php
 
-$date = new MongoDB\BSON\UTCDateTime('1416445411987');
+$date = new MongoDB\BSON\UTCDateTime(new MongoDB\BSON\Int64('1416445411987'));
 var_dump($date instanceof MongoDB\BSON\UTCDateTimeInterface);
 
 ?>
diff --git a/tests/bson/bug0631.phpt b/tests/bson/bug0631.phpt
index c07f95863..3099076cd 100644
--- a/tests/bson/bug0631.phpt
+++ b/tests/bson/bug0631.phpt
@@ -7,7 +7,7 @@ date.timezone=UTC
 
 require_once __DIR__ . '/../utils/basic.inc';
 
-$utcdatetime = new MongoDB\BSON\UTCDateTime('1466540755123');
+$utcdatetime = new MongoDB\BSON\UTCDateTime(new MongoDB\BSON\Int64('1466540755123'));
 $datetime = $utcdatetime->toDateTime();
 $s = serialize($datetime);
 
diff --git a/tests/writeResult/writeresult-getupsertedids-002.phpt b/tests/writeResult/writeresult-getupsertedids-002.phpt
index 786fa0956..713a8c212 100644
--- a/tests/writeResult/writeresult-getupsertedids-002.phpt
+++ b/tests/writeResult/writeresult-getupsertedids-002.phpt
@@ -25,7 +25,7 @@ $tests = [
     new MongoDB\BSON\MinKey,
     new MongoDB\BSON\ObjectId('586c18d86118fd6c9012dec1'),
     new MongoDB\BSON\Timestamp(1234, 5678),
-    new MongoDB\BSON\UTCDateTime('1483479256924'),
+    new MongoDB\BSON\UTCDateTime(new MongoDB\BSON\Int64('1483479256924')),
 ];
 
 $manager = create_test_manager();