[Bug Report] dateTimePicker组件设置startDate后，选择最早月份的最早时间，之后重新设置绑定的value无效

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#1,074 opened on Aug 28, 2017 0 comments 0 reactions 0 assignees View on GitHub

Description

### Mint UI version
2.2.9

### OS/Browsers version
Chrome 60.0.3112.101, weixin 6.5.14

### Vue version
2.2.6

### Reproduction Link
[https://jsfiddle.net/pj71jkyw/498/](https://jsfiddle.net/pj71jkyw/498/)

### Steps to reproduce
dateTimePicker组件设置startDate后，选择最早月份的日期，之后再改变绑定的value显示的还是之前选择的日期

代码和重现链接中的类似，具体表现可以看截图
![image](https://user-images.githubusercontent.com/12495960/29778756-f5c14b36-8c42-11e7-9fcf-df98a605d729.png)

之后选择最开始的日期

![image](https://user-images.githubusercontent.com/12495960/29778782-0d155214-8c43-11e7-98ea-a88c11b5d0f8.png)

重设日期value，然而日期没有变化

![image](https://user-images.githubusercontent.com/12495960/29778801-2adfc04a-8c43-11e7-83e1-23d4ce83c8a8.png)

### What is Expected?
绑定的value显示为想要设置的日期

### What is actually happening?
绑定的value显示的是dateTimePicker中之前选择的日期

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