The data returned by create api is inconsistent with the data just inserted in the database

[yuenshui]

Description/Steps to reproduce

1. mysql database
2. type:datetime
3. model json :

    "created": {
      "type": "date",
      "required": true,
      "defaultFn": "now"
    }

4. use model create(), insert a line data.
5. returned result object
6. the model findById(result.id), returned object
7. the creation property of two objects is one second difference

null: ad_stats {__cachedRelations: Object, __data: Object, __dataSource: undefined, __strict: false, __persisted: true, …}
__cachedRelations: Object {}
__data: Object {openId: "H4xUDVzUCxYriWmwEiHvRQ==", fromOpenId: "H4xUDVzUCxYriWmwEiHvRQ==", configId: "1", …}
__dataSource: undefined
__persisted: true
__strict: false
$amount: 200
$coinId: "TMT"
$collected: false
$configId: "1"
$countBy: 20180926
$created: Wed Sep 26 2018 15:19:19 GMT+0800 (CST)
$fromOpenId: "H4xUDVzUCxYriWmwEiHvRQ=="
$id: 6
$openId: "H4xUDVzUCxYriWmwEiHvRQ=="
amount: 200
coinId: "TMT"
collected: false
configId: "1"
countBy: 20180926
created: Wed Sep 26 2018 15:19:19 GMT+0800 (CST)
__proto__: Object {constructor: , toString: , toDateString: , …}
errors: false
fromOpenId: "H4xUDVzUCxYriWmwEiHvRQ=="
id: 6
limit: 1
offset: 0
openId: "H4xUDVzUCxYriWmwEiHvRQ=="
order: Array(1) ["id"]
skip: 0
__proto__: PersistedModel {id: <accessor>, openId: <accessor>, fromOpenId: <accessor>, …}
null: ad_stats {__cachedRelations: Object, __data: Object, __dataSource: undefined, __strict: false, __persisted: true}
__cachedRelations: Object {}
__data: Object {id: 6, openId: "H4xUDVzUCxYriWmwEiHvRQ==", fromOpenId: "H4xUDVzUCxYriWmwEiHvRQ==", …}
__dataSource: undefined
__persisted: true
__strict: false
$amount: 200
$coinId: "TMT"
$collected: false
$configId: "1"
$countBy: 20180926
$created: Wed Sep 26 2018 15:19:20 GMT+0800 (CST)
$fromOpenId: "H4xUDVzUCxYriWmwEiHvRQ=="
$id: 6
$openId: "H4xUDVzUCxYriWmwEiHvRQ=="
amount: 200
coinId: "TMT"
collected: false
configId: "1"
countBy: 20180926
created: Wed Sep 26 2018 15:19:20 GMT+0800 (CST)
fromOpenId: "H4xUDVzUCxYriWmwEiHvRQ=="
id: 6
openId: "H4xUDVzUCxYriWmwEiHvRQ=="
__proto__: PersistedModel {id: <accessor>, openId: <accessor>, fromOpenId: <accessor>, …}

Link to reproduction sandbox

Expected result

Additional information

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