When [Bug Report] [BUG]dateTimePicker sets range, the binding time is given the initial value, and when default-time is added, it shows errors.

[weihaopeng]

Element UI version

2.3.8

OS/Browsers version

macOS10.13.4 / Chrome 66.0.3359.139

Vue version

2.5.17-beta.0

Reproduction Link

https://jsfiddle.net/n220yunz/3/

Steps to reproduce

v-model绑定的value赋予初始值，且设定default-time（default-time的时间值与绑定的value初始值的时间不相等）

What is Expected?

v-model绑定的value赋予初始值，且设定default-time（default-time的时间值与绑定的value初始值的时间不相等），此时打开dateTimePicker，显示的默认状态的时间部分应该时value初始值设定的时间

What is actually happening?

v-model绑定的value赋予初始值，且设定default-time（default-time的时间值与绑定的value初始值的时间不相等），此时打开dateTimePicker，会发现时间部分是按default-time来设置的而非初始值。

[element-bot]

Translation of this issue:

Element UI version
2.3.8

OS/Browsers version
MacOS10.13.4 / Chrome 66.0.3359.139

Vue version
2.5.17-beta.0

Reproduction Link
https://jsfiddle.net/n220yunz/3/

Steps to reproduce
The value bound by V-model gives the initial value and sets default-time (the time value of default-time is not equal to the time when the initial value of value is bound).

What is Expected?
The value bound by the V-model gives the initial value and sets the default-time (the time value of the default-time is not equal to the time of the value initial value of the binding), when the dateTimePicker is opened, and the time part of the default state of the display should be set when the initial value of the value is set.

What is actually happening?
The value bound by the V-model gives the initial value and sets the default-time (the time value of the default-time is not equal to the time of the value initial value of the binding), and when the dateTimePicker is opened, the time part is found to be set according to the default-time rather than the initial value.