Time stamp different per date

When I create an object via the REST API and use Property 20 to set the Creation date there is a difference in time stamp depending on the date.

1.

"PropertyDef": 20,
"TypedValue": {
"Value": "2016-11-17T09:11:00Z",
"DataType": 7,
"IsMultiValue": false },
"HasValue": true,
"IsAutomatic": false,
"IsClassAssociated": false

Shows 11/17/2016 10;11 AM

2.

PropertyDef": 20,
"TypedValue": {
"Value": "2016-06-07T09:11:00Z",
"DataType": 7,
"IsMultiValue": false },
"HasValue": true,
"IsAutomatic": false,
"IsClassAssociated": false

Shows 6/7/2016 11;11 AM

When I query the Object then in both cases it shows:

CreatedUtc: 2016-xx-xxT09:11:00Z

Created: 2016-xx-xxT09:11:00Z

I'm lost, does anyone know why this happens?